British Foreign Secretary Jack Straw says Thursday's bombings in London have the hallmarks of an al-Qaida related attack.
Mr. Straw made the comment at the Group of Eight summit in Scotland, where he is chairing the meeting in place of British Prime Minister Tony Blair, who left to return to London after word of the attacks came.
Authorities in London say 37 people are confirmed dead and 700 injured in the bombs that ripped through three subway trains and a double-decker bus during the morning rush hour.
Speaking in London, Mr. Blair said the perpetrators were acting in what he called "the name of Islam," but said most Muslims around the world deplore such acts. He pledged to bring the perpetrators to justice, and said Britain will not be intimidated.
A group calling itself the Secret Organization of al-Qaida in Europe posted a statement on an Arabic website taking responsibility. The authenticity of the statement could not be confirmed.
