An Islamist terror plot to assassinate British Prime Minister Theresa May was foiled by MI5 and local police, according to a report Tuesday by Sky News.

Police believe the suicide attack would have involved the detonation of an improvised explosive device on Downing Street in London, which is where the prime minister's office is located. In the aftermath of the explosion, amid the disarray, May would be killed.

Armed police arrested two men last week who were charged Tuesday with preparing acts of terrorism.

This story is breaking and will be updated.