A terror plot to assassinate Prime Minister Theresa May has been foiled, Sky sources have confirmed.
An Islamic extremist planned to use an improvised explosive device to blow up the gates of Downing Street before entering No 10 to make an attempt on Theresa May's life.
Earlier this week a spokesperson for Ms May said British authorities had foiled nine terrorist plots in the last 12 months.
It was not clear on Tuesday night what stage the plot was in or if any suspects have been arrested.
Sky News added that this was something which has been pursued over several weeks at least by Scotland Yard, MI5 and West Midlands Police.
According to The Telegraph, details of the alleged terror plot were given to Cabinet members on Tuesday during a briefing by MI5 chief Andrew Parker.
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In a statement, the Met said Naa'imur Zakariyah Rahman, of North London, and Mohammed Aqib Imran, from Birmingham, were arrested during raids in London and Birmingham last week.
Two people are arrested - 20 and 21 years old, who are already accused of preparing a terrorist act.
It comes as a new report found that security services could possibly have prevented a suicide attack at the Manchester Arena in May.
But Anderson, a former terrorism law reviewer asked by the government to review the recent spate of terror attacks, concluded there is "no cause for despair".
Stringent protective measures were first put in place in the 1970s, and were tightened during the 1980s when Irish republicans launched attacks on the British mainland. John Major, the prime minister at the time, was inside but not hurt.
The IRA had previously targeted prime minister Margaret Thatcher at the Conservative conference in Brighton in 1984.