The terrorists planned to use the ensuing chaos to target and kill Theresa May.
"It is in essence an extreme suicide plot against Downing Street", it said.
It was not clear on Tuesday night what stage the plot was in or if any suspects have been arrested.
Female Democratic senators call on Al Franken to resign
Franken, in his statement, said the idea he would claim such conduct as a right as an entertainer was "preposterous". Al Franken of trying to forcibly kiss her against her will, according to Politico . "Enough is enough.
"This is something which has been pursued over several weeks at least by Scotland Yard, MI5 and West Midlands Police".
The two men who were arrested on November 28 for the foiled plot are Naa'imur Zakariyah Rahman, 20, of north London, and Mohammed Aqib Imran, 21, of Birmingham, according to a Metropolitan Police news release.
Imran is charged with preparing acts of terrorism.
MI5 investigators misinterpreted intelligence on Salman Abedi earlier this year and it was disclosed his case was due to be discussed at a meeting scheduled for nine days after his May attack at the Manchester Arena.
Gus Malzahn, Auburn Reportedly Agree on New Contract Amid Arkansas Rumors
As of Sunday evening, Gus Malzahn said nothing had changed in terms of him being the head coach at Auburn next season. Auburn's head coach was pressed on the rumors and reports coming out of Arkansas throughout this past weekend.
Rahman is charged with assisting Imran in "making preparations for the attack", according to the FT.
Naa'imur Zakariyah Rahman, 20, allegedly had an explosive device in his bag and planned a bomb assault on the prime minister's residence.
In 1991, Irish Republican Army (IRA) militants launched a mortar bomb attack on Number 10.
No breakthrough in Brexit talks, says EU's Jean-Claude Juncker
Juncker backed May's statement, saying he could also see a deal on the horizon, adding that it could take place even before a summit of European Union member states slated for mid-December.