would not fall into a "trap". iran's supreme leader, ayatollah ali khamenei, has promised retaliation for the killing, tweeting that the scientist's nuclear work will continue. there have been demonstrations in tehran over the assassination, with protesters calling for revenge against israel and the united states. israel has not commented, but it has previously accused the victim of friday's attack, mr fakhrizadeh, of masterminding a covert nuclear weapons programme. 0ur diplomatic correspondent, paul adams, reports. angry protests once more on the streets of the iranian capital. people here in no doubt about who was behind yesterday's killing. we demand a hard revenge against america and israel, says this university student. the father of iran's nuclear programme is now being treated like a martyr, his assassination on the subject of much debate. 0ur enemies are becoming weak, he says. assassination is the work of those