UK Prime Minister Theresa May addressed the media from 10 Downing Street following an attack outside the Palace of Westminster in London earlier today. 

May characterized the attack as "sick and depraved" and affirmed that the UK's threat level has been set to "severe" for the foreseeable future. 

"This appalling incident began when a single attacker drove his vehicle into pedestrians," May stated. "The location of this attack was no accident."

"Our thoughts and prayers go out to all who have been affected,' May said. 

The attack left four people dead, including one police officer and the attacker, and at least 20 injured.