Dozens of people were evacuated from a University of Hong Kong staff quarters on Monday, after a World War II bomb was discovered at a nearby construction site in Pok Fu Lam.
Bomb experts detonated the AN64 bomb overnight after hours of preparation.
Other residents in the area were advised to stay away from windows in case of explosion, while those unable to return to their homes were offered shelter at Lei Tung Community Hall.
The authorities said the bomb weighed over 200 kilogrammes and contained around 100kg of TNT. It was dropped by the US air force during the Second World War.
Unexploded wartime bombs or grenades are frequently found by hikers or construction workers in the city, which was the scene of fierce fighting between Japanese and British allied forces in 1941. US and allied air forces bombed Japanese occupiers after the then-British colony fell.
Last year, police disposed of eight explosive devices found by a hiker. In 2014 police defused a wartime bomb weighing nearly one tonne, the largest yet found in the city. More than 2,200 people were evacuated. (Additional reporting by AFP)
Last updated: 2017-01-24 HKT 05:44