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.
A Downing Street spokesman said earlier that Parker had told cabinet ministers that while Islamic State had suffered serious defeats in Iraq and Syria, "this did not mean the threat is over, rather it has spread into new areas, including trying to encourage attacks in the United Kingdom and elsewhere via propaganda on social media".
Parker spoke to members of Theresa May's cabinet about terrorist threats.
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Read alsoSBU: Female suspect in assassination of counterintel colonel in Mariupol detained in OdesaAfter reviewing the security services' actions in relation to four terrorist attacks in the United Kingdom this year, Mr. Anderson said: "It is conceivable that the Manchester attack, in particular, might have been averted had the cards fallen differently".
One of those arrested is 20-year-old Naa'imur Zakariyah Rahman.
Imran is charged with preparing acts of terrorism. The two suspects would have attempted to kill May in the chaos surrounding the explosion at her official London residence, authorities say. "Rather it is spreading to new areas, including trying to encourage attacks in the United Kingdom and elsewhere via propaganda on social media".
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News of the plot comes hours after the release of an official report on the bombing attack in Manchester previous year. The report also showed that MI5 could have stopped the Manchester terror attack with the intelligence they had.
Lawyer David Anderson wrote the report.
After four militant attacks this year that killed 36 people in Britain - the deadliest spate since the London "7/7" bombings of July 2005 - MI5 chief Andrew Parker said the threat was at the highest tempo he had seen in 34 years of espionage.
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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.