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A spokesman for the United Kingdom prime minister says Britain has thwarted nine plots to kill Theresa May in the last 12 months. He said that his service had prevented nine terrorist attacks this year.

Naa'imur Zakariyah Rahman, left, and Mohammed Aquib Imran are seen in the dock at Westminster Magistrates' Court in London, Dec. 6, 2017. He said he was of no fixed abode and said his nationality was "Bangladeshi British".

Police believe that the plan was to launch some sort of improvised explosive device at the Prime Minister's residence at Downing Street and in the ensuing chaos to attack and kill Theresa May.

"The secondary attack on No. 10 was to be carried out with a suicide vest, pepper spray and a knife", the document said.

He appeared in court alongside Imran, 21, who is accused of trying to join the Islamic State jihadist terror group by trying to obtain a fake passport with a view to travelling to Libya.

"Policing and our colleagues in the fight against terrorism will continue to learn and improve", Metropolitan Police Commissioner Cressida Dick said in a statement Tuesday.

They remain in custody and are due to appear in court on Wednesday, local time.

The PM's official spokesman declined to discuss the details of the attacks, but several newspapers later reported that the two men arrested in London and Birmingham last week had been behind the plot.

The court appearence comes a day after an official report said the suicide bombing that killed 22 people at an Ariana Grande concert at the Manchester Arena in northern England in May could have been thwarted. The then prime minister, John Major, was inside but was not hurt. Thirty-six people have died in four terror attacks in Britain this year.