Five wartime hand grenades were destroyed by bomb disposal experts in Angus last night.
The grenades were detonated just before 7pm after being uncovered around 4pm at the former airfield in Montrose.
Work is ongoing at the site as part of unexploded ordnance clearance work by GE Oil and Gas ahead of a £9 million expansion.
A loud bang was heard as the controlled explosion was carried out between two giant mounds of earth on the building site.
It was the second time in successive days that bomb disposal experts had been called in, having destroyed another two hand grenades that were found at the site on Wednesday.
A non-intrusive survey is beingcarried out to identify debris, metallic items and ferrous contamination beforeconstruction begins.
Due to the nature of the former land use there was always going to be the potentialfor unexploded ordnance items to be uncovered.
As well as the hand grenades found in the past few days, the work has also uncovered munitions including 20mm and 303 ammunition rounds.
It is GE’s environment, health and safety policy to have these items cleared prior to any development of the site.
Any findings of military heritageinterest are being offered to the Montrose Air Station Heritage Centre for their records and exhibits.
Montrose resident David Milnewitnessed a controlled explosion earlier this week at the site.
He said: “I was out walking the dog at the time and I heard this big bang but it was odd, not like a normal bang. It was more of a boom. I looked over and there was a big puff of smoke. I noticed several men in yellow jackets making a cordon to keep people back.”
GE employs 246 people across two sites in Montrose, and 646 in Aberdeen.