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Armed Metropolitan Police counter terrorism officers take part in an exercise on the River Thames in London on August 3, 2016.

Metropolitan Police Commissioner Bernard Hogan-Howe and Mayor of London Sadiq Khan announced the start of Operation Hercules in which 600 additional firearms officers will be deployed in visible roles in the capital.
 / AFP / POOL / Stefan Rousseau        (Photo credit should read STEFAN ROUSSEAU/AFP/Getty Images)
Armed Metropolitan Police counter terrorism officers take part in an exercise on the River Thames in London on August 3, 2016.

Metropolitan Police Commissioner Bernard Hogan-Howe and Mayor of London Sadiq Khan announced the start of Operation Hercules in which 600 additional firearms officers will be deployed in visible roles in the capital.
 / AFP / POOL / Stefan Rousseau        (Photo credit should read STEFAN ROUSSEAU/AFP/Getty Images)

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London's armed cops readying for terror attack

London's police force announced they will deploy an additional 600 armed officers across the capital as part of its Operation Hercules. CNN's Nima Elbagir went along to the show of force.

London's armed cops readying for terror attack

London's police force announced they will deploy an additional 600 armed officers across the capital as part of its Operation Hercules. CNN's Nima Elbagir went along to the show of force.