Mark Carroll, a prosecutor, told the Westminster Magistrates Court on Wednesday that Rahman had planned to throw explosives at the gates of 10 Downing Street. In the ensuing chaos, he hoped to gain access to Mrs. May's office and conduct a "secondary attack" using "a bulletproof vest, pepper spray and knife." Its purpose was to "attack, kill and cause explosions."  The defendant did not indicate how they would testify when the case is presented before a higher court in Old Bailey, the central criminal court in London, on December 20.
In Parliament on Tuesday, Home Secretary Amber Rudd said that 22 Islamist plots had been prevented in the past four years, nine of them since March, when an attacker in a sports car destroyed pedestrians and stabbed a police officer outside parliament. Five people died in that attack, including the assailant, a 52-year-old Briton, Khalid Masood.
In May, Salman Abedi, a 22-year-old Briton of Libyan descent, blew himself up in front of the concert hall in Manchester, killing himself and 22 other people.
In June, three men: Khuram Shazad Butt, a British citizen born in Pakistan; Rachid Redouane, a failed asylum seeker who said he was Moroccan or Libyan; and Youssef Zaghba, an Italian of Moroccan descent, drove a van to pedestrians on the London Bridge and then used knives to attack people in the nearby Borough Market. Eleven people were killed, including three assailants, who were shot by the police.
Later that same month, a British man, Darren Osborne, drove a van to a crowd of worshipers outside the Finsbury Park mosque in London. A man died shortly thereafter and Mr. Osborne was charged with murder.
On Tuesday, an official report on the attacks in May and June said that anti-terrorist officers had misinterpreted two intelligence elements handed to them before the murders in Manchester. Mr. Abedi was not being actively investigated at the time of the attack, but intelligence elements could have led to an investigation if his "true significance had been well understood."
Counterintelligence officers "got a great deal," the report said. "Particularly in the case of Manchester, they could have succeeded if the cards had fallen differently."
The report was written by David Anderson, a senior lawyer commissioned by Ms. May to review anti-terrorist efforts.
Separately, Scotland Yard said on Tuesday: "The United Kingdom faces an intense threat of terrorism, which is multidimensional, evolving rapidly and operating at a scale and rhythm we had not seen before"
. Counter-terrorism specialists have said that one of the sources of concern is that Islamic State fighters may return to Britain after the military defeats in Iraq and Syria. Ms. Rudd said on Tuesday that the British security services were involved in more than 500 investigations involving more than 3,000 people.
Continue reading the main story