Norwich shoppers were greeted by a strange sight this afternoon after two police officers were spotted on top of a commercial unit's roof.

Norwich Evening News: Police firearms officers on the roof of Primark for a training exercise. Picture: DENISE BRADLEYPolice firearms officers on the roof of Primark for a training exercise. Picture: DENISE BRADLEY (Image: Archant)

The trained firearms officers were dressed in all black, with their hoods up and scarves around their necks, and were stationed on Primark's roof.

The pair were carrying out a training exercise, and were equipped with binoculars as they attempted to identify a fellow officer dressed in plain clothes.

This is part of the officers' training as part of the constabulary's contingency plan.

A fellow officer remarked that today's snowy conditions were a good day for training, as it would improve the firearms officers' resilience.