Hong Kong police say 19 people have been killed after a double-decker bus crashed in a suburb of the southern Chinese city.

A police spokeswoman says 17 men and two women were killed in the accident, which local media reports say happened when the bus tipped over on Saturday evening.

She did not have any more details and did not give her name, as is customary under department rules.

Photos and videos published by local media or posted by users on social media showed the gold-colored bus lying on its side while emergency workers treat injured passengers nearby.

The South China Morning Post newspaper said it was the Asian financial center's deadliest traffic accident since a 2003 bus accident that killed 21.