Police believe the plotters planned to detonate an improvised explosive device at the prime minister's Downing Street offices and kill May in the chaos, Sky reported, citing people it didn't identify.
"This is something which has been pursued over several weeks at least by Scotland Yard, MI5 and West Midlands Police".
Addressing the Cabinet, Parker reportedly said the IS had been defeated in Syria and Iraq but was continuing to orchestrate attacks on Britain.
Rahman appeared in Westminster Magistrates' Court in central London along with Mohammed Aqib Imran, 21, from the central city of Birmingham, who is accused of trying to join the Islamic State, PA said.
However, the Metropolitan Police released a statement earlier today confirming two men were arrested in the United Kingdom last week charged with preparing terrorist attacks.
News of the plot comes hours after the release of an official report on the bombing attack in Manchester a year ago.
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In October, Manafort pleaded not guilty to charges including conspiracy to launder money and conspiracy against the United States. As Mueller's investigation unfolds, Trump has gone on the offensive. "I think that's a violation", Mr.
Nine terrorist attacks have been prevented in Britain during the past 12 months, the country's security service MI5 revealed on Tuesday. Five people died in the attack. An official report into the attack released on Tuesday found opportunities to thwart it had been missed.
The alleged plot highlights the extreme threat still faced by the United Kingdom in a year blighted by terrorist atrocities which claimed 36 lives.
In addition, the report said the leader of another terror attack, who used knives on London Bridge in June, had been under investigation by MI5.
Security measures were introduced in the 1970s but were increased in the 1980s as the threat from Irish republican groups grew. 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.