London's mayor Sadiq Khan led a vigil on Monday (June 5) to honour the victims of extremist attacks in the heart of the capital, in which seven people were killed and dozens needed hospital treatment, with 18 still in a critical condition. He condemned the attackers, calling them "sick and evil extremists" and saying London would "never be broken by terrorism".In Britain's third Islamist attack in as many months, three men rammed a van into pedestrians on London Bridge in the late evening on Saturday (June 3) before running into the bustling Borough Market area, where they slit throats and stabbed people indiscriminately.All three attackers were shot dead by police, who made at least a dozen arrests in east London on Sunday (June 4) and carried out further raids on Monday morning.