Baltimore Mayor Stephanie Rawlings-Blake speaks at a news conference outside the Mondawmin Mall in Baltimore, Maryland May 3, 2015. Rawlings-Blake on Sunday lifted a 10 p.m. to 5 a.m. curfew she had imposed on the city last week after a night of looting and arson that followed the death of 25-year-old Freddie Gray from injuries suffered while in the police custody. REUTERS/Eric Thayer 

A man is seen detained in the back of a police van after defying a 10 pm curfew in west Baltimore, Maryland, May 2, 2015. Thousands of people took to the streets of Baltimore on Saturday as anger over the death of a young black man turned to hopes for change following swift criminal charges against six police officers. There was an upbeat mood at the march from the housing projects where 25-year-old Freddie Gray was arrested last month to a plaza in front of city hall where the city's chief prosecutor announced charges on Friday ranging from murder to assault in his death. Picture taken May 2, 2015. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

A man is placed into a police van after defying a 10 pm curfew in Baltimore, Maryland, May 2, 2015. Thousands of people took to the streets of Baltimore on Saturday as anger over the death of a young black man turned to hopes for change following swift criminal charges against six police officers. There was an upbeat mood at the march from the housing projects where 25-year-old Freddie Gray was arrested last month to a plaza in front of city hall where the city's chief prosecutor announced charges on Friday ranging from murder to assault in his death. Picture taken May 2, 2015. REUTERS/Adrees Latif 

Demonstrators rally at city hall in Baltimore, Maryland May 3, 2015. Baltimore Mayor Stephanie Rawlings-Blake on Sunday lifted a 10 p.m. to 5 a.m. curfew she had imposed on the city last week after a night of looting and arson that followed the death of 25-year-old Freddie Gray from injuries suffered while in the police custoday. REUTERS/Eric Thayer 

A demonstrator wearing a T-shirt on which the words, "I am Freddie" are written, holds flowers at North Avenue and Pennsylvania Avenue in Baltimore, Maryland May 1, 2015. Baltimore residents cautiously celebrated news on Friday that six police officers involved in the arrest of Freddie Gray face criminal charges, a marked contrast to recent rioting over fraught relations between police and the African-American community. REUTERS/Eric Thayer TPX IMAGES OF THE DAY

A police officer douses a man, who was hit by pepper spray after defying a curfew, with water as he lies detained in west Baltimore, Maryland May 2, 2015. Thousands of people took to the streets of Baltimore on Saturday as anger over the death of young black man Freddie Gray turned to hopes for change following swift criminal charges against six police officers. There was an upbeat mood at the march from the housing projects where 25-year-old Gray was arrested last month to a plaza in front of city hall where the city's chief prosecutor announced charges on Friday ranging from murder to assault in his death. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

A demonstrator is taken into custody after a citywide curfew in Baltimore, Maryland May 2, 2015. Thousands of people took to the streets of Baltimore on Saturday as anger over the death of young black man Freddie Gray turned to hopes for change following swift criminal charges against six police officers. REUTERS/Eric Thayer 

A large crowd gathers for a rally at Baltimore city hall in Baltimore, Maryland May 2, 2015. Hundreds of people took to the streets of Baltimore on Saturday as anger over the death of a young black man turned to hopes for change following swift criminal charges against six police officers. REUTERS/Carlos Barria

A man holds a child on a car at North Ave and Pennsylvania Ave in Baltimore, Maryland May 1, 2015. Baltimore police officers involved in the arrest of Freddie Gray will face criminal charges, including manslaughter and murder, in the death of the 25-year-old black man, the city's chief prosecutor said on Friday. REUTERS/Eric Thayer 

Demonstrators march in Baltimore, Maryland May 2, 2015. Hundreds of people took to the streets of Baltimore on Saturday as anger over the death of young black man Freddie Gray turned to hopes for change following swift criminal charges against six police officers. REUTERS/Eric Thayer 

Residents demanding justice for Freddie Gray take part in a post-march celebration on the streets of west Baltimore, Maryland May 2, 2015. Thousands of people took to the streets of Baltimore on Saturday as anger over the death of a young black man turned to hopes for change following swift criminal charges against six police officers. There was an upbeat mood at the march from the housing projects where 25-year-old Freddie Gray was arrested last month to a plaza in front of city hall where the city's chief prosecutor announced charges on Friday ranging from murder to assault in his death. REUTERS/Adrees Latif 

Two children watch the scene at West North Avenue and Pennsylvania Avenue near the looted and burned CVS Pharmacy as residents demonstrate against police brutality and celebrate the decision to prosecute police officers in the death of 25 year old Freddie Gray in Baltimore, Maryland May 2, 2015. A jubilant Baltimore headed into a weekend of rallies on Saturday after six police officers were criminally charged over the arrest of a 25-year-old black man whose death led to rioting earlier in the week. REUTERS/Jim Bourg 

A large crowd marches from Baltimore City Hall to the scene of unrest earlier in the week, in Baltimore, Maryland May 2, 2015. Thousands of people took to the streets of Baltimore on Saturday as anger over the death of young black man Freddie Gray turned to hopes for change following swift criminal charges against six police officers. REUTERS/Lucas Jackson 

Malik Tiller (in red), 13, sits among his brother and cousins while holding a sign during a rally, which organizers said was against police brutality and in support for the city of Baltimore, outside City Hall in downtown Baltimore, Maryland May 2, 2015. A jubilant Baltimore headed into a weekend of rallies after six police officers were criminally charged over the arrest of 25-year-old black man Freddie Gray whose death led to rioting earlier in the week. REUTERS/Adrees Latif 

Two women hug at the intersection of West North Avenue and Pennsylvania Avenue during a rally in Baltimore, Maryland May 2, 2015. Hundreds of people took to the streets of Baltimore on Saturday as anger over the death of a young black man turned to hopes for change following swift criminal charges against six police officers. REUTERS/Jim Bourg

Two Baltimore children watch the scene at West North Street and Pennsylvania Avenue near the looted and burned CVS Pharmacy as residents demonstrate against police brutality in Baltimore, Maryland May 2, 2015. A jubilant Baltimore headed into a weekend of rallies after six police officers were criminally charged over the arrest of 25-year-old black man Freddie Gray whose death led to rioting earlier in the week. REUTERS/Jim Bourg 

Pedestrians walk by as police officers take position in front of businesses on Howard Street in downtown Baltimore, Maryland May 2, 2015. More demonstrations were planned in Baltimore on Saturday and Baltimore officials said the curfew would remain in effect through the weekend. REUTERS/Jim Bourg

People celebrate as they gather in the streets of Baltimore, Maryland May 1, 2015 following the decision to charge six Baltimore police officers -- including one with murder -- in the death of Freddie Gray, a black man who was arrested and suffered a fatal neck injury while riding in a moving police van, the city's chief prosecutor said on Friday. REUTERS/Lucas Jackson 

A woman holds a sign in front of police officials near the corner of North Avenue and Pennsylvania Avenue after a news conference by prosecutor Marilyn Mosby in Baltimore, Maryland May 1, 2015. Baltimore's chief prosecutor charged one police officer with murder on Friday and five others with lesser crimes in the death of a young black man, Freddie Gray, who suffered a critical neck injury while in police custody, the latest case to spark national protests over law enforcement's treatment of minorities. Gray, 25, sustained his fatal injury while riding in a police transport van on April 12, the prosecutor said, citing the autopsy report. Gray succumbed to his spinal injuries in hospital on April 19. REUTERS/Adrees Latif 

A young boy greets police officers in riot gear during a march in Baltimore, Maryland May 1, 2015 following the decision to charge six Baltimore police officers -- including one with murder -- in the death of Freddie Gray, a black man who was arrested and suffered a fatal neck injury while riding in a moving police van, the city's chief prosecutor said on Friday. REUTERS/Lucas Jackson 

Residents carrying signs stage a 'die-in' rally on a street of west Baltimore, Maryland May 1, 2015. Baltimore residents cautiously celebrated news on Friday that six police officers involved in the arrest of Freddie Gray face criminal charges, a marked contrast to recent rioting over fraught relations between police and the African-American community. REUTERS/Adrees Latif 

A man rides his bicycle near the intersection of W North and Pennsylvania Avenues in Baltimore, May 1, 2015. Baltimore's chief prosecutor charged one police officer with murder on Friday and five others with lesser crimes in the death of Freddie Gray, a young black man who suffered a critical neck injury in the back of a police van, a case that fueled new anger over police treatment of minorities. REUTERS/Sait Serkan Gurbuz 

Celebrating residents hold signs toward a passing vehicle with National Guard troops in west Baltimore, Maryland May 1, 2015. Baltimore's chief prosecutor charged one police officer with murder on Friday and five others with lesser crimes in the death of Freddie Gray, a young black man who suffered a critical neck injury in the back of a police van, a case that fueled new anger over police treatment of minorities. REUTERS/Adrees Latif 

A man shouts slogans during a protest at the intersection of W North and Pennsylvania Avenues in Baltimore, May 1, 2015. Baltimore's chief prosecutor charged one police officer with murder on Friday and five others with lesser crimes in the death of Freddie Gray, a young black man who suffered a critical neck injury in the back of a police van, a case that fueled new anger over police treatment of minorities. REUTERS/Sait Serkan Gurbuz TPX IMAGES OF THE DAY TPX IMAGES OF THE DAY

People react as police line up at North Ave and Pennsylvania Ave in Baltimore, Maryland May 1, 2015. Baltimore police officers involved in the arrest of Freddie Gray will face criminal charges, including manslaughter and murder, in the death of the 25-year-old black man, the city's chief prosecutor said on Friday. REUTERS/Eric Thayer 

Demonstrators take to the the streets of Baltimore, Maryland May 1, 2015. Baltimore residents cautiously celebrated news on Friday that six police officers involved in the arrest of Freddie Gray face criminal charges, a marked contrast to recent rioting over fraught relations between police and the African-American community. REUTERS/Lucas Jackson 

Demonstrators take to the the streets of Baltimore, Maryland May 1, 2015. Residents shouted with joy, embraced and honked car horns on Friday on the same Baltimore streets where rioters had clashed with police earlier this week in anger over the death of Freddie Gray, a black man who suffered severe spinal injuries while in custody. REUTERS/Adrees Latif

A Wicomico County Sheriff deputy lifts a child to sit on an armored vehicle as demonstrators celebrate in the the streets in Baltimore, Maryland May 1, 2015. Baltimore residents cautiously celebrated news on Friday that six police officers involved in the arrest of Freddie Gray face criminal charges, a marked contrast to recent rioting over fraught relations between police and the African-American community. REUTERS/Lucas Jackson 

People react as police line up at North Ave and Pennsylvania Ave in Baltimore, Maryland May 1, 2015. Baltimore police officers involved in the arrest of Freddie Gray will face criminal charges, including manslaughter and murder, in the death of the 25-year-old black man, the city's chief prosecutor said on Friday. REUTERS/Eric Thayer 

A man fist-bumps police officers as people begin to celebrate in the streets of Baltimore, Maryland May 1, 2015 following the decision to charge six Baltimore police officers -- including one with murder -- in the death of Freddie Gray, a black man who was arrested and suffered a fatal neck injury while riding in a moving police van, the city's chief prosecutor said on Friday. REUTERS/Lucas Jackson 

People react as police line up at North Ave and Pennsylvania Ave in Baltimore, Maryland May 1, 2015. Baltimore police officers involved in the arrest of Freddie Gray will face criminal charges, including manslaughter and murder, in the death of the 25-year-old black man, the city's chief prosecutor said on Friday. REUTERS/Eric Thayer 

People react as police line up at North Ave and Pennsylvania Ave in Baltimore, Maryland May 1, 2015. Baltimore police officers involved in the arrest of Freddie Gray will face criminal charges, including manslaughter and murder, in the death of the 25-year-old black man, the city's chief prosecutor said on Friday. REUTERS/Eric Thayer 

People celebrate as they gather in the streets of Baltimore, Maryland May 1, 2015 following the decision to charge six Baltimore police officers -- including one with murder -- in the death of Freddie Gray, a black man who was arrested and suffered a fatal neck injury while riding in a moving police van, the city's chief prosecutor said on Friday. REUTERS/Lucas Jackson 

People react as police line up at North Ave and Pennsylvania Ave in Baltimore, Maryland May 1, 2015. Six Baltimore police officers will face criminal charges, including second-degree murder and manslaughter, in the death of a black man who was arrested and suffered fatal injuries while riding in a moving police van, the city's chief prosecutor said on Friday. REUTERS/Eric Thayer 

People react as police line up at North Ave and Pennsylvania Ave in Baltimore, Maryland May 1, 2015. Six Baltimore police officers will face criminal charges, including second-degree murder and manslaughter, in the death of Freddie Gray, a black man who was arrested and suffered a fatal neck injury while riding in a moving police van, the city's chief prosecutor said on Friday. REUTERS/Eric Thayer 

People celebrate as they gather in the streets following the decision to charge six police officers in Baltimore, Maryland May 1, 2015 Six Baltimore police officers have been charged, including one with murder, in the death of Freddie Gray, a black man who was arrested and suffered a fatal neck injury while riding in a moving police van, the city's chief prosecutor said on Friday. REUTERS/Lucas Jackson 

A man gestures as military vehicles drive on the streets of Baltimore, Maryland May 1, 2015. Residents shouted with joy, embraced and honked car horns on Friday on the same Baltimore streets where rioters had clashed with police earlier this week in anger over the death of Freddie Gray, a black man who suffered severe spinal injuries while in custody. Hundreds of people gathered at the scene of some of Monday night's rioting in the West Baltimore neighborhood, closely watched by National Guard troops and police officers. REUTERS/Lucas Jackson 

Baltimore state attorney Marilyn Mosby speaks on recent violence and says there is "probable cause to file criminal charges in the Freddie Gray case" of officers involved in the arrest of the black man who later died of injuries he sustained while in custody in Baltimore, Maryland May 1, 2015. REUTERS/Adrees Latif 

A girl writes on the sidewalk near North Ave and Pennsylvania Ave in Baltimore, Maryland May 1, 2015. Baltimore police officers involved in the arrest of Freddie Gray will face criminal charges, including manslaughter and murder, in the death of the 25-year-old black man, the city's chief prosecutor said on Friday. REUTERS/Eric Thayer TPX IMAGES OF THE DAY

Demonstrators are seen near the city's central detention facilities in Baltimore, Maryland May 1, 2015. Baltimore police officers involved in the arrest of Freddie Gray will face criminal charges, including manslaughter and murder, in the death of the 25-year-old black man, the city's chief prosecutor said on Friday. REUTERS/Eric Thayer TPX IMAGES OF THE DAY