Firefighters are investigating the cause of a garage fire in San Po Kong on Tuesday night during which several explosions were heard.

The blaze broke out at around 8pm. It was raised to a No 3 alarm after midnight and was largely put out before 4am on Wednesday.

Almost 200 firefighters and ambulance personnel were mobilised.

The Fire Services Department said about 50 motorcycles were damaged in the blaze, adding that a large amount of smoke from burning vehicle parts complicated firefighting efforts.

One firefighter felt unwell and was taken to hospital for treatment. No one else was hurt.