A deadly blast shook a neighbourhood in the Thai capital Bangkok in early April, killing at least eight people.
The bomb turned out to be from the 1940s, when Allied forces dropped thousands of explosives in the country which was then occupied by Japan.
It was dug up at a nearby construction site, then sold off as scrap. Workers were taking it apart with a blowtorch when it detonated.
It was the first such incident in Bangkok, and police are now taking steps to ensure it will be the last.
Al Jazeera's Scott Heidler reports from Bangkok.