Westminster attack: Tributes for dead pour in as #WeAreNotAfraid trends

Tributes have been flooding in for the police officer and two members of the public killed in a car and knife attack in Westminster.An assailant, dressed in black and armed with two large knives, brought terror to central London on Wednesday as he rammed into members of the public before crashing his car into the rails outside Parliament.Police said the attacker, who is believed to have acted alone, then repeatedly stabbed a police officer, before being shot dead by the officer's colleagues.