LONDON- Police believe they have identified all four suicide bombers who carried out the deadly attacks on London subway trains and a bus last week, the city's police chief said Thursday.
"You don't need to be a suicide bomber in a liberal democracy. They have chosen to be," Metropolitan Police Commissioner Ian Blair told the Foreign Press Association in the first public confirmation from police that the July 7 attackers were suicide bombers.
Bombs exploded on three subway trains and a double-decker bus, killing at least 52 people.
Blair said police believe "that we know who the four people carrying the bombs were ... and we believe they are all dead."
"We are as certain as we can be that four people were killed and they were the four people carrying bombs," Blair added.
News reports have quoted police sources as saying three of the bombers were Britons of Pakistani descent, and a fourth was a British resident born in Jamaica. Blair declined to comment on that report.