WORKMEN had the shock of their lives when they found two unexploded Second World War hand grenades.
Police warned residents not to leave their homes as they cordoned off a park and several roads so they could safely detonate the devices.
The shock find last Thursday brought emergency services rushing to a building site in Parkway, off Long Lane, Hillingdon.
Specialist explosives officers attended the scene and inspected the site for more grenades.
They later carried out a controlled explosion in nearby Court Park, and a small crater is still evident.
Shaun Sweeney, 63, who lives in Sweetcroft Lane, Hillingdon, which backs on to Court Park, was told not to leave his home and to open his windows.
He said: "It sounded like a bomb going off, literally.
"There were big lumps of earth thrown 20 feet across the park by the explosion.
"The first I knew was when I saw the police in my garden and I asked them what was going on, and they advised me to open my windows because if they were closed the noise from the explosion could shatter them.
"We live a sleepy life here in Sweetcroft Lane. Many of the residents are elderly. It is not often we have grenades found around the corner.
"It is the most exciting thing to happen round here that I can remember.
"It was a real mystery to us. Nobody knew where the grenades had come from.
"I usually walk my dog through the park, but nobody was allowed in that day. Police made sure nobody could go through."
To safely detonate the grenades, the experts had to bury them deep underground and then cover them with a pile of sand.
They said it was fortunate the grenades were discovered so close to a park with open space, so they could quickly be taken there, with local people out of harm's way.
Ambulance officers were also sent to the scene as a precaution, and police were keen to stress that the grenades were merely wartime relics and in no way linked to terrorism of modern times.
It is the second time in the past 10 months that Second World War bombs have been found in Uxbridge.
Last August, toddlers and staff were evacuated from Young Ones Nursery in Gatting Way, when a box of explosives was found.
The explosives were later safely detonated by experts.