The "ruthless fanatics" who killed 27 people in Istanbul can target anywhere in the world, the British Foreign Secretary, Mr Jack Straw, has warned.
As he visited the scene of one of the suicide bomb blasts that struck the Turkish city, Mr Straw said the blasts looked like being the work of al-Qaeda "associates".
"I'm afraid to say that with these ruthless fanatics who we now face, everywhere is a target. It's been Istanbul over the last week but over the years it has been from New York to Indonesia, to Saudi Arabia, to Morocco.
"This is something which, I'm afraid, is a terrorism that attacks the world and where the targets are across the world."
Mr Straw flew to Istanbul on Thursday to view the blast scenes for himself and speak to those who had been injured and bereaved. Speaking from the bomb site, he said: "This is an attack on civilisation, it is indiscriminate."
He said the democracies of Turkey and Britain were "bound together".
"In the British House of Commons yesterday there was overwhelming not only backing for Turkey, but support and affection for Turkey," Mr Straw said.