An unexploded grenade was blown up in a controlled explosion by the Surbiton riverside this evening.

The loud boom at about 8pm surprised nearby residents while neighbouring roads were cordoned off for the detonation.

A police officer in Portsmouth Road said a hand grenade had been found by a person with a metal detector.

The riverside was closed off about an hour before the explosion.

Portsmouth Road re-opened shortly afterwards.

Did you see what happened? Are you the person with the metal detector? Email newsdesk@surreycomet.co.uk or call 020 8744 4244.