ZHENGZHOU -- A garment factory in central China's Henan Province caught fire on Saturday afternoon, killing two workers and injuring another four.

Flames engulfed the top floor of a six-story factory building in the provincial capital Zhengzhou at around 1:20 p.m., a spokesperson with the city's fire brigade said.

He said the flames were put out at 4 p.m. and four people were hospitalized.

Two bodies were found when the firefighters searched the building after the fire was extinguished.

Witnesses said they heard explosions before the fire.

The cause of the accident is under investigation.