Scotland Yard has revealed the creation of a new unit of armed police officers who will be used to tackle the threat of a gun attack in Britain.
The SAS-style counter-terror unit will comprise of 130 specialist firearms officers (CTSFOs) and will be equipped with new weapons.
They will also receive training in other counter-terror tactics such as storming buildings to rescue hostages and fast-roping from helicopters.
Their formation comes as police and other emergency services carry out a full-scale counter terror exercise in central London on Tuesday morning, following the Tunisian massacre which took the lives of a suspected 30 holidaying Brits.
The new armed unit has trained alongside the army and will be deployed in response to shootings, like the Tunisian attack, and potential sieges which could develop from an assault.