Chemical plant blast adds to hazard in aftermath of Hurricane Harvey

Fires and two explosions have rocked a flooded chemical plant in Texas, sending up a plume that federal authorities described as “incredibly dangerous” and adding a potential new hazard to the aftermath of Hurricane Harvey.

The blasts at the Arkema plant, about 40 kilometres (25 miles) north-east of Houston, also ignited a 30ft to 40ft flame.

The French operator of the plant said up to eight more chemical containers could burn and explode.

Local officials insisted that the explosion produced no toxins.

The blasts happened as floodwaters from days of relentless rain began to recede and the threat of major dangers from the storm shifted to a region near the Texas Louisiana line.

Fire authorities said the blasts were small and that some deputies suffered irritated eyes from the smoke, but they emphasised that the materials that caught fire shortly after midnight were not toxic.

Even so, the Texas Commission on Environmental Quality urged people in the area to stay indoors with their windows closed and air conditioners running, and to restrict physical activity.

Particles from smoke and chemicals can affect people with heart and lung problems.

The White House says US President Donald Trump will pledge $1 million in personal funds to Hurricane Harvey relief efforts.

AP. Picture: The plant lost power during the storm.