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According to Houston Transtar's website, the two-vehicle incident happened at around 2:28 p.m.
Transtar cameras show an overturned 18-wheeler causing a hazmat spill across the westbound lanes of I-610 North Loop.
Three lanes had been blocked westbound, and crews completed cleanup at around 6:17 p.m., according to Houston Transtar's website.
It's unclear to what led up to the rollover and the details of the other vehicle involved.
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