An oil tanker in Hong Kong’s southern waters on Tuesday caught fire, killing one crew member while at least 21 were rescued, police said.

The witnesses of the incident reporting a loud blast that shook windows several kilometers away.

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The rescue operations were going on about one nautical mile south of Lamma Island.

“There are still some crew that haven’t been saved,” a police spokeswoman told Reuters. She was not immediately able to provide more details including the name of the tanker, or its size.

A picture of the coastal oil tanker posted on a police Facebook page showed it listing with black smoke pouring from the hull. The ship’s name, Aulac Fortune, could be seen on the stern.