A police team is investigating the source of metal debris after Cambodia's air force reported a plane explosion on Tuesday.
However, Cambodia retracted its comment after Vietnamese media reported that an unidentified flying object exploded in mid-air over a southern Vietnamese island.
The Vietnam News Agency says residents of nearby Phu Quoc Island found shards of gray metal, including a piece 1.5 meters long.
Villagers in Kampot say they also heard a loud explosion and that they found small chunks of metal near the coastline.
[Bou Han, Local Fisherman]:
"One day after the explosion I found the metal pieces while fishing. I didn't know where these debris came from so I kept them hoping I could sell them."
Another villager found small debris while working in his paddy field, having no idea where the small piece of metal could have come from.
"This is the first time that a piece of metal dropped near me."
According to the Vietnam News Agency the explosion occurred about eight kilometers above the ground and the object could have been an airplane.
Soldiers were sent out to look for wreckage and survivors, and local authorities contacted airlines in Vietnam, Cambodia and Thailand, but received no reports of a missing aircraft.