THE US military has dug up a farmer's field in Essex to search for the remains of a Second World War airman unaccounted for after his plane crashed and exploded.

The B-26 Marauder bomber took off two days before D-Day on a mission to bomb a bridge in Nazi-occupied France, but experienced engine failure after leaving RAF Stansted Mountfitchet.

The twin-engined aircraft crash landed on June 4 1944, with its six crew and cargo of two 2,000lb bombs still inside.

Four airmen managed to escape from the burning wreckage and survived, but a fifth died at the scene when the two bombs exploded.

His remains were recovered.

The sixth airman remains unaccounted for, and US military personnel from the Defence POW/MIA Accounting Agency are searching for his remains.

Sergeant First Class Peter Holderness, team sergeant, said the agency's mission is to "find and retrieve our nation's fallen service members and account for as many as possible".

The agency requested the precise location of the field remain secret so trophy hunters cannot find it.

It also asked the airman's name is not published out of sensitivity to his descendants.

Sgt Holderness said "possible osseous material", matter consisting of or turned into bone, had been found during the excavation.

Lab analysis is required to verify what it actually is.

If the initial dig fails to locate the airman's remains, a permit could be sought to return for a further dig.

The agency did not specify the precise length of the initial dig, which finished in August.

During the dig, a 23-strong team sifted through excavated soil using hoses to find items of interest among the dirt.

These were placed in buckets and then inspected further, with any bone matter or "material evidence" such as a dog tag or rings to be sent to the agency's lab in Hawaii.

The agency said any finds will be notified to the authorities.

If the remains of the sixth airman are found and identified, his descendants will be notified, the agency said.

The airman could be reburied at Arlington National Cemetery in Virginia, which is the final resting place for thousands of America's service members.

The excavation in Essex is the agency's first in the UK.