A total of nine terrorist attacks have been prevented in the UK in the past year, MI5 has said.
MI5 has previously said that 13 terror attacks were prevented in the past four years.
The director general of MI5, Andrew Parker, told the Cabinet of the number of prevented attacks this morning, according to Downing Street.
The numbers have been released ahead of the publication of an investigation into the internal reviews by the security services and police into a wave of terror attacks in Britain this year.
Attacks at Westminster Bridge, Manchester, London Bridge and Finsbury Park have prompted internal reviews by police and MI5.