Doha: Five people were killed and three others were hospitalized in toxic gas eruption at a factory in the city of Hebi, Central China’s Henan province.

According to Qatar News Agency, the incident occurred at the Hexin Chemical Industry Co., Ltd. in Shancheng District, when a sulfuric-acid storage tank was believed to have leaked, sending acid into the plant’s storm-water system and then into a septic tank, where it reacted to produce hydrogen-sulfide gas.

One of the injured is in serious but stable condition, while the two others sustained minor injuries, the district’s emergency management reported. Operations have been halted, and all personnel have been evacuated from the site. A full investigation is now in progress.

In 2015, China experienced one of its worst industrial accidents when massive chemical explosions in the northern city of Tianjin killed at least 165 people.