British police are today hunting for the 'bucket bomber' who tried to blow up a rush hour Tube train and injured 29 people - but Donald Trump say the terror suspect was already in Scotland Yard's 'sights' before the attack. The crude IED could have killed dozens but failed to properly detonate and sent a 'wall of fire' through the carriage at Parsons Green Station injuring at least 22 people including a ten-year-old boy. Today officers are hunting for the bomber - and a potential cell - amid claims the terror suspect is armed with knives and may have left other devices. Terrified passengers were seen covered in blood with scorched hands, legs, faces and hair - others suffered crush injuries during a 'human stampede' as they 'ran for their lives' in west London at 8.20am. But the US President has sparked a diplomatic row after tweeting: 'Another attack in London by a loser terrorist and saying police should be 'more proactive'. Washington and London found themselves at loggerheads after the Manchester terror attack when US officials named the suicide bomber as Salman Abedi when police refused to say.