Number 10 Downing Street is the official residence of the prime minister.
An Islamist extremist planned to blow up the gates of Downing Street and use pepper spray and a knife to try to kill the prime minister Theresa May, police say.
Earlier this week a spokesperson for Ms May said British authorities had foiled nine terrorist plots in the last 12 months.
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Sky News added that this was something that has been pursued over several weeks at least by Scotland Yard, MI5 and West Midlands Police.
They will be produced before Westminster Magistrates' Court on terror charges on Wednesday. The report said British security forces had missed chances to stop the attack.
In March, Khalid Masood drove a auto at pedestrians on Westminster Bridge and stabbed a policeman guarding Parliament. The same report found that the ringleader of the June London Bridge attack was actively under investigation at the time.
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The plan, revealed to the British Cabinet on Tuesday, allegedly involved planting a bomb outside the entrance to Downing Street gates before attackers would stab the United Kingdom leader in the ensuing chaos.
The suspects were detained during raids in London and Birmingham last week and charged with terrorism offences. The device landed in the back garden.
Mrs Thatcher narrowly avoided injury but five people were killed - including a Conservative MP.
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