The unit will increase in size to 80 troops, 'The Sunday Times' quoted a source close to the elite regiment as saying.
The aim is to ensure security services have the manpower and skill to tackle co-ordinated attacks3 by gunmen and suicide bombers like those that left 130 dead in Paris in November 2015.
Police in London have an elite force of about 130 anti- terrorism officers trained by the SAS to fire weapons in "close quarters combat" and to drop from helicopters by rope.
The UK's Ministry of Defence declined to comment on security operations.
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