Fire and smoke billows from an army weapons depot after it was hit by an air strike in Yemen's capital Sanaa May 11, 2015. REUTERS/Mohamed al-Sayaghi TPX IMAGES OF THE DAY

An injured woman carrying a child reacts after air strikes hit the house of Yemen's former President Ali Abdullah Saleh in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

A man screams in front of the residence of Yemen's former President Ali Abdullah Saleh after airstrikes hit it in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi TPX IMAGES OF THE DAY

People flee as smoke billows after air strikes hit the house of Yemen's former President Ali Abdullah Saleh in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi TPX IMAGES OF THE DAY

Men take pictures outside the residence of the Yemen's former President Ali Abdullah Saleh is seen after an airstrike destroyed it in Sanaa May 10, 2015. REUTERS/Mohamed al-Sayaghi 

The residence of Yemen's former President Ali Abdullah Saleh is seen after airstrikes destroyed it in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

Fire and smoke billows from an army weapons depot after it was hit by an air strike in Yemen's capital Sanaa May 11, 2015. REUTERS/Mohamed al-Sayaghi 

A plainclothes presidential guard stands in front of the residence of Yemen's former President Ali Abdullah Saleh after airstrikes destroyed it in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

A plainclothes presidential guard stands in front of the residence of Yemen's former President Ali Abdullah Saleh after airstrikes destroyed it in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

A man looks toward the residence of the Yemen's former President Ali Abdullah Saleh after airstrikes destroyed it in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

A plainclothes presidential guard walks on the rubble of the residence of Yemen's former President Ali Abdullah Saleh after airstrikes destroyed it in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

A plainclothes presidential guard stands in front of the residence of Yemen's former President Ali Abdullah Saleh after airstrikes destroyed it in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

Plainclothes presidential guards stand in front of the residence of Yemen's former President Ali Abdullah Saleh after airstrikes destroyed it in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

Smoke billows from an army weapons depot after it was hit by an air strike in Yemen's capital Sanaa May 11, 2015. REUTERS/Mohamed al-Sayaghi 

Plainclothes presidential guards walk on the rubble of the residence of Yemen's former President Ali Abdullah Saleh after airstrikes destroyed it in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

The residence of Yemen's former President Ali Abdullah Saleh is seen after airstrikes hit it in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

People flee as smoke billows after air strikes hit the house of Yemen's former President Ali Abdullah Saleh in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

People watch as smoke billows after air strikes hit the house of Yemen's former President Ali Abdullah Saleh in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi 

Smoke billows after air strikes hit the house of Yemen's former President Ali Abdullah Saleh in Sanaa May 10, 2015. Saleh and his family are safe after airstrikes targeted his residence in the capital Sanaa early on Sunday, a news agency allied to the former Yemeni president said. REUTERS/Mohamed al-Sayaghi