AZUSA — Authorities continued seeking a truck that leaked a highly toxic chemical on a six-block stretch of Foothill Boulevard, prompting a closure for much of the day and a clean-up operation with a $10,000 price tag.

The chemical was later identified as chromic acid — a toxic and carcinogenic cleaning material used in metal plating, Azusa police Cpl. Terry Smith said in a written statement.

“Witnesses reported the substance was leaking from an unidentified stake bed style truck that was traveling eastbound Foothill,” Smith said.

The acid leaked onto eastbound lanes of the road from the 900 block of West Foothill Boulevard to the 300 block of West Foothill Boulevard, police added.

Westbound traffic lanes were briefly shut down following the spill, and eastbound lanes in the area remained closed for much of the day.

“The clean up costs were estimated at approximately $10,000,” Smith added.

No injuries were reported as a result of the spill, officials said.

Anyone with information is asked to call Azusa police at 626-812-3200.