PETROLIA, Pennsylvania (AP) -- A corrosive liquid overflowed from a tank at a chemical plant in western Pennsylvania on Saturday, evaporating into a toxic cloud that snaked along the ground and forced about 2,500 people to flee. At least three residents were believed to be injured.
A dense cloud of toxic gas moved close to the ground in parts of Petrolia, Pennsylvania, on Saturday.
A material called oleum, similar to sulfuric acid, leaked from a tank at the Indspec Chemical Corp. plant in Petrolia, said plant manager Dave Dorko.
Authorities were concerned about the potential for respiratory damage and skin burns, said Freda Tarbell, spokeswoman for the state Department of Environmental Protection.