London - UK Police arrested seven people in the investigation into a lone-wolf attacker who killed three people and injured 40 before being shot dead by police near parliament in London, Britain's most senior counter-terrorism officer said on Thursday, Reuters News Agency reported. Mark Rowley said there were four dead including the attacker and 29 people still being treated in hospital, seven of whom were in a critical condition. Police had said on Wednesday that the death toll was five in the worst such attack in Britain since 2005.
