A dramatic video shows a hand grenade exploding on a popular tourist beach in Yorkshire after a teenager stumbled across the World War 2 relic by accident.

The incident, filmed in Cat Nab, Saltburn, came about when 14-year-old Azaan Jami was looking fossils on Sunday, September 13.

He raised the alarm and the police were called at around 3.30pm, The Northern Echo reports.

A 50-metre cordon was put up around the explosive device which forced several roads to temporarily close.

In the clip, recorded by witness Nathan Robinson, two men in camouflage clothing are looking towards the cliffs at the far side of the beach.

The explosion drew a huge crowd of people
The explosion drew a huge crowd of people

There's then a deafening bang and a cloud of debris fly skywards as the device is blown-up by the explosive ordnance disposal team.

A flock of gulls panic and fly into the air while the people who have gathered to watch the spectacle from behind the cordon cheer and clap.

"My God!" says one of them as the blast echoes off the cliffs.

The deafening bang drew oohs and aahs from the witnesses
The loud bang drew oohs and aahs from the witnesses

Local people were advised to stay away from the area for safety reasons.

In a statement, Cleveland Police said: "The incident at Saltburn has been brought to a safe conclusion, the old hand grenade has been destroyed by the explosive ordnance disposal team and the area is now open.

"We would like to thank everyone for their patience during this incident."

Unsurprisingly, the dramatic incident in the usually-peaceful seaside town caused quite a stir on social media.

"Road closed, beach closed – bomb disposal folk flying in – only in Yorkshire," joked a dog walker.

A second person commented: "It'll be a drill one. They'd rarely have had live ones anywhere near the beach. Probably never."

Sounding bemused, another resident tweeted: "We were sitting on Saltburn beach yesterday afternoon and were totally oblivious to any of this happening."