Emergency services, police and intelligence agencies will carry out the largest-ever rehearsal of a response to a terror attack across the city today. Exercise Strong Tower will involve more than 1,000 officers.
A major counter-terrorism exercise is being carried out in London for a second day to ensure emergency services are prepared.
A mock terrorist firearms attack is being staged in the capital to test the response to a Tunisian-style mass shooting.
Officers, emergency services, soldiers and intelligence officials are taking part in the operation.
The unlicensed events unfolded on Saturday night at Clapham Common and Tooting Bec Common.
A 37 year old man who was taken to hospital after getting into difficulty in a stretch of water near Maidenhead has died.
Jonty Bravery, who is mentally ill, has been jailed for 15 years after throwing a six year old boy from the Tate modern balcony.