Fires continue to burn at the site, but TPC officials say the fires are contained.
On Friday, the mandatory evacuation and curfew order in effect for the Port Neches area was lifted by Jefferson County Judge Jeff Branick.
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Now, officials are worried about a possible asbestos exposure, which could look like a white chalky substance in debris.
TPC officials can not say how long the fires will continue to burn, but they encourage anyone who finds debris to call their hotline.
The initial blast happened around 1 a.m. Wednesday at the TPC Group plant off Highway 366. The facility is approximately 95 miles east of Houston.
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Two employees and one contractor were injured in the blast, but all were treated and released from hospitals, officials said.
By early Wednesday afternoon, another blast rocked the plant as personnel continued to fight the fires on site. That explosion was caused by the collapse of a flaring tower, according to Jefferson County Emergency Management Coordinator Michael White.
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More flaring towers could also fall as the response continued, White said, and the fire may take days to put out.
Butadiene, a known carcinogen, is the chemical that is burning, according to officials.