English: Soldiers of 2nd Battalion, The Parachute Regiment, and The King's Troop, Royal Horse Artillery, perform security duties at 10 Downing Street alongside armed officers of the Metropolitan Police as part of Op TEMPERER.

Operation TEMPERER – the mobilisation plan for military support to the police service in response to a major terrorist attack.

It is an established security plan by the Government which aims to help protect civilians at times of high terror threat when the official national threat level is raised to critical.

Military personnel are deployed alongside the police at nominated sites to provide additional protective security.

They backfilled existing armed guarding roles filled by armed police units, thereby releasing armed police officers to support the wider incident response.

During this deployment, soldiers were working under police command and replaced or supplemented armed police officers to guard major sites such as rail stations, Parliament, embassies and Buckingham Palace.

• Organization: Army
• Object Name: APOLOND-2017-067 Op Temperer (29 05 17) 437

• Category: MOD
• Supplemental Categories: Police & MGS, Civilians, People, Army
• Keywords: Soldier, Non-Identifiable, Pegasus Emblem, Protective security, Major terrorist attack, United Kingdom, TEMPERER, Op, Operations, Personnel, Anti-terror, Security, Deployment, Op Temperer, London, Army, Regiments, Police, Metropolitan Police, The Parachute Regiment, Paras, 2nd Bn The Parachute Regiment, 2 PARA, Downing Street, Communications, Radio, PRR, Personal Role Radio
• Country: United Kingdom