Ten phosphorus US Navy flare containers have been found in two days between Cromer and Heacham.

A Great Yarmouth coastguard spokesman said the flares were very dangerous and any findings should be reported to coastguards or the police.

If anyone finds one of these objects - do not touch it - move away from it - call 999 and ask for the Coastguard.

The light blue/grey containers are about 20 inches (60cm) long and marked 'CCC' in a green band at one end.

At the other end they are marked "Do not handle - contains phosphorous" on a white band.

Around all the four sides are the words "Down or forward when launched" and a large black arrow.

When activated they smoke for up to 15 - 20 minutes, and when filled can weigh about 10kg (25lbs).

"They are usually found at high water mark on the beach and they are considered to be very dangerous as the phosphorous cannot be considered to be fully expended," the coastguard spokesman added.

"The affected beach lies close to weapons ranges, and these recent unexploded flares have been released from aircraft. We believe they have been washed ashore on the tide."

He said others may be blown or arrive on high tides.

The Portsmouth-based Joint Services Explosive Ordnance Disposal (EOD) team has been called in to dispose of the flares.