Knife-Wielding Attacker Shot Outside British Parliament, Pedestrians Mowed Down on Westminster Bridge

A knife-wielding man stabbed a police officer to death outside British Parliament Wednesday after several people were mowed down by a SUV on the Westminster Bridge, authorities said.
At least four people were killed, including the cop, and 20 people were injured along the thoroughfare fronting Parliament in London before the attacker was fatally shot by police.
Prime Minister Theresa May was bundled into a car by plain-clothes security officers and whisked from the scene, according to loca