Kuwaiti lawyer Salem al-Hashash, who represents Jassim Emwazi, gestures during a news conference in Salmiya March 8, 2015. The lawyer representing Jassim Emwazi, the father of a man identified as the masked killer in Islamic State beheading videos said on Sunday Western officials had presented no proof his client's son was the so-called "Jihadi John". U.S. media and government sources have said the black-clad militant who apparently decapitated hostages including Americans, Britons and Syrians in the videos had been named as Mohammed Emwazi, a Kuwait-born Londoner. REUTERS/Stephanie McGehee (KUWAIT - Tags: CRIME LAW) 

Two police officers walk outside a flat in London February 26, 2015. Local media reported that the flat is the former home of Mohammed Emwazi. Investigators believe that the "Jihadi John" masked fighter who fronted Islamic State beheading videos is a British man named Mohammed Emwazi, two U.S. government sources said on Thursday. He was born in Kuwait and comes from a prosperous family in London, where he grew up and graduated with a computer programming degree, according to the Washington Post. REUTERS/Stefan Wermuth (BRITAIN - Tags: CRIME LAW CONFLICT TPX IMAGES OF THE DAY) 

A doormat lies outside the entrance of a flat in London February 26, 2015. Local media reported that the flat is the former home of Mohammed Emwazi. Investigators believe that the "Jihadi John" masked fighter who fronted Islamic State beheading videos is a British man named Mohammed Emwazi, two U.S. government sources said on Thursday. He was born in Kuwait and comes from a prosperous family in London, where he grew up and graduated with a computer programming degree, according to the Washington Post. REUTERS/Stefan Wermuth (BRITAIN - Tags: CRIME LAW CONFLICT TPX IMAGES OF THE DAY) 

The BT telecommunications tower stands behind a University of Westminster campus building in central London, February 26, 2015. Mohammed Emwazi studied computer science at Westminster University. Investigators believe that the "Jihadi John" masked fighter who fronted Islamic State beheading videos is a British man named Mohammed Emwazi, two U.S. government sources said on Thursday. He was born in Kuwait and comes from a prosperous family in London, where he grew up and graduated with a computer programming degree, according to the Washington Post.REUTERS/Toby Melville (BRITAIN - Tags: CIVIL UNREST POLITICS EDUCATION CONFLICT) 

Media stand outside a flat in London February 26, 2015. Local media reported that the flat is the former home of Mohammed Emwazi. Investigators believe that the "Jihadi John" masked fighter who fronted Islamic State beheading videos is a British man named Mohammed Emwazi, two U.S. government sources said on Thursday. He was born in Kuwait and comes from a prosperous family in London, where he grew up and graduated with a computer programming degree, according to the Washington Post. REUTERS/Stefan Wermuth (BRITAIN - Tags: CRIME LAW CONFLICT) 

A performs a wheelie on a bicycle on an estate is seen in West London, February 26, 2015. Local media reported that Mohammed Emwazi used to live nearby. Investigators believe that the "Jihadi John" masked fighter who fronted Islamic State beheading videos is a British man named Mohammed Emwazi, two U.S. government sources said on Thursday. He was born in Kuwait and comes from a prosperous family in London, where he grew up and graduated with a computer programming degree, according to the Washington Post. REUTERS/Stefan Wermuth (BRITAIN - Tags: CRIME LAW CONFLICT POLITICS) 

The playground on an estate is seen in West London, February 26, 2015. Local media reported that Mohammed Emwazi used to live nearby. Investigators believe that the "Jihadi John" masked fighter who fronted Islamic State beheading videos is a British man named Mohammed Emwazi, two U.S. government sources said on Thursday. He was born in Kuwait and comes from a prosperous family in London, where he grew up and graduated with a computer programming degree, according to the Washington Post. REUTERS/Stefan Wermuth (BRITAIN - Tags: CRIME LAW CONFLICT POLITICS) 

The front door of a flat is seen in west London February 26, 2015. Local media reported that the flat is the former home of Mohammed Emwazi. Investigators believe that the "Jihadi John" masked fighter who fronted Islamic State beheading videos is a British man named Mohammed Emwazi, two U.S. government sources said on Thursday. He was born in Kuwait and comes from a prosperous family in London, where he grew up and graduated with a computer programming degree, according to the Washington Post. REUTERS/Stefan Wermuth (BRITAIN - Tags: CRIME LAW CONFLICT) 

People walk in and out of a University of Westminster campus building in central London, February 26, 2015. Mohammed Emwazi studied computer science at Westminster University. Investigators believe that the "Jihadi John" masked fighter who fronted Islamic State beheading videos is a British man named Mohammed Emwazi, two U.S. government sources said on Thursday. He was born in Kuwait and comes from a prosperous family in London, where he grew up and graduated with a computer programming degree, according to the Washington Post.REUTERS/Toby Melville (BRITAIN - Tags: CIVIL UNREST POLITICS EDUCATION CONFLICT) 

The playground and garden on an estate are seen in West London, February 26, 2015. Local media reported that Mohammed Emwazi used to live nearby. Investigators believe that the "Jihadi John" masked fighter who fronted Islamic State beheading videos is a British man named Mohammed Emwazi, two U.S. government sources said on Thursday. He was born in Kuwait and comes from a prosperous family in London, where he grew up and graduated with a computer programming degree, according to the Washington Post. REUTERS/Stefan Wermuth (BRITAIN - Tags: CRIME LAW CONFLICT POLITICS) 

The playground on an estate is seen in West London, February 26, 2015. Local media reported that Mohammed Emwazi used to live nearby. Investigators believe that the "Jihadi John" masked fighter who fronted Islamic State beheading videos is a British man named Mohammed Emwazi, two U.S. government sources said on Thursday. He was born in Kuwait and comes from a prosperous family in London, where he grew up and graduated with a computer programming degree, according to the Washington Post. REUTERS/Stefan Wermuth (BRITAIN - Tags: CRIME LAW CONFLICT POLITICS TPX IMAGES OF THE DAY)