© Getty Mrs May was given backing by Boris Johnson and Michael Gove to increase the bill offer A terror plot to assassinate Prime Minister Theresa May has been foiled, Sky sources have confirmed. Sky's Crime Correspondent Martin Brunt said: "It's the latest in a number of terror plots that police and MI5 believe they've foiled this year. "I understand that the head of MI5, Andrew Parker, briefed Cabinet ministers today, such is the seriousness of what they believed they have uncovered. "It is in essence an extreme Islamist suicide plot against Downing Street. Essentially police believe that the plan was to launch some sort of improvised explosive device at Downing Street and in the ensuing chaos attack and kill Theresa May, the Prime Minister." "This is something which has been pursued over several weeks at least by Scotland Yard, MI5 and West Midlands Police. It came to a head last week with the arrest of two men, by armed police, who earlier today were charged with preparing acts of terrorism." Naa'imur Zakariyah Rahman, 20, from north London and Mohammed Aqib Imran, 21, from south-east Birmingham are due to appear at Westminster Magistrates' Court on Wednesday morning.