A British man was found guilty on Wednesday of a plot to kill Prime Minister Theresa May by first detonating an explosive device to get into her Downing Street office and then using a knife or a gun to attack her.

Naa'imur Rahman, 20, of north London, was convicted at the Old Bailey court of preparing to commit acts of terrorism.

Rahman planned to detonate an improvised explosive device at the gates of Downing Street and gain access to May's office in the ensuing chaos and kill her, according to police.