About 200 residents have been evacuated from a Pittsburgh suburb after a freight train derailed.
Several cars plunged into the Allegheny River. One leaked an unknown amount of anhydrous hydrogen fluoride, a chemical used in steel making. Officials said earlier that it was hydrogen chloride and did not leak.
Thirteen of the Norfolk Southern train's 83 cars derailed at about 5:30 a.m. in East Deer Township. A state official says no significant environmental impact is expected.
Residents have been evacuated as a precaution. It's not clear when they can go home.
Water departments downriver of the accident have been notified. Some roads in the area are closed.