SAFETY concerns have been raised after an unexploded grenade was believed to be discovered by treasure hunters searching in a Colchester beauty spot “without permission”.

Last Friday, Colchester Council wardens discovered 20 rounds of historical live ammunition on the riverbank in Castle Park.

The ammunition was safely handed over to Essex Police for disposal.

However, following further inspection of the area, a suspected hand grenade was found submerged in the river on Sunday morning.

Gazette: Incident - a Second World War grenade was found on the river bank in Castle ParkIncident - a Second World War grenade was found on the river bank in Castle Park (Image: Essex Police)

Gazette: Device - the grenade which was discovered in Castle ParkDevice - the grenade which was discovered in Castle Park (Image: Colchester Council)

Police were notified, and Army bomb disposal experts were called in.

The incident saw part of the park evacuated, according to a member of the public.

The resident, who was with his daughter at the time, said: “We were at the duck pond and four to five officers turned up and told everyone there to leave immediately.”

“Then two army officers showed up just after with some sort of equipment."

Police said the device was found to be an old Second World War grenade.

The grenade was then safely detonated in a controlled environment in Lower Castle Park.

Colchester Council has said it is suspected these items may have been unearthed by individuals searching for treasure without permission.

A spokesman said: “The discoveries raise serious safety concerns and highlight the risks associated with unauthorised digging along the riverbanks, however, it is important to note that, before they were disturbed, the deeply buried ammunition did not pose a risk to the public.

“Anyone wishing to use a metal detector or dig on council land should not do so without permission.

“These activities not only pose a threat to public safety, but also risk causing irreversible damage to the environment and local wildlife.”

In response to the incident, Colchester City Council has installed signs along the riverbanks to deter unauthorised digging and disturbance.

Gazette: Warning - Colchester Council leader David KingWarning - Colchester Council leader David King (Image: Newsquest)

David King, leader of the Council, said: “I am deeply concerned about the recent incidents along our riverbank, but incredibly thankful that no one was hurt.

“The safety of our residents and the preservation of our natural environment are of utmost importance.

“I urge members of the public to refrain from unauthorised digging and to respect the guidelines in place to protect our cherished green spaces.”