Five alleged plots Arrests by police in last two months

March 29: Man and woman arrested in Birmingham. Ummariyat Mirza is charged with planning to carry out a knife attack and possessing a bomb-making guide. Zainub Mirza is charged with sending Islamic State propaganda videos and executions to others.

April 27: Police seize Khalid Mohammed Omar Ali close to Downing Street while allegedly carrying knives.

April 28: Woman shot and wounded by police raiding a house in north London to break up what is believed to be first all-female alleged terror plot. Rizlaine Boular, 21, her mother Mina Dich, 43, and Khawla Barghouthi, 20, charged over alleged planning of a knife attack.

May 17: Four men held in east London and police say they disrupted plot to cause a deadly attack. They remain in custody.

Unknown: Fifth plot broken up with arrests not under terrorism laws, sources say.