Two men appeared in court Wednesday in London on terror charges over an alleged plot to kill British Prime Minister Theresa May, according to British government officials.

Officials say the men conspired to launch a suicide-knife attack on Downing Street, the official home of the Prime Minister.

News of the foiled assassination plot broke shortly after the head of Britain’s domestic intelligence service MI5, Andrew Parker, had briefed the cabinet on the terrorist threat and informed ministers that his service had thwarted nine terrorist attacks this year.

He informed ministers of the plot during the briefing, although the information was held back from the media for several hours.

Both of the conspirators were arrested last week in raids by counterterrorism officers in London and Birmingham, according to police officials. One of the men, named as Naa’imur Zakariyah Rahman, 20, is accused of preparing acts of terrorism.

He was allegedly carrying two improvised explosive devices, which were inert, when he was arrested November 28 in London. His suspected co-conspirator was named as 21-year-old Mohammed Aqib Imran. He was seized 90 minutes later in a raid on a house in Birmingham in the English Midlands.

Imran also is accused of previously trying to secure a fake passport in a bid to reach Libya to join the Islamic State affiliate in the North African country.

According to officials, both men were plotting a bomb assault on the security gates protecting the entrance of Downing Street. Rahman then allegedly planned to storm Number Ten, wearing a suicide vest and using pepper spray and a knife, in an effort to kill Theresa May.

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 U.K. and elsewhere via propaganda on social media.”

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SOURCE: Voice of America, Jamie Dettmer