Possible spill reported in the Potomac

Update, 7:43 p.m.:

D.C. fire department hazmat crews cleared the scene on the Potomac River at Chain Bridge, after authorities learned the substance found in the water was an organic cleaner, and not harmful to the water quality, said Pete Piringer, a fire department spokesman. Authorities cleared the scene at about 6:30 p.m.

Earlier:

District hazmat crews are investigating a report Tuesday of an unknown substance in the Potomac River near Chain Bridge, officials said.

Authorities were called to the scene about 4 p.m. and found a "blue-green" colored substance in the water, said Pete Piringer, a D.C. fire and emergency department spokesman. No fish or wildlife appeared to be dead in the area, Piringer said.

Initial reports supsected the incident may have been some sort of fuel spill, but hazmat crews are conducting tests to determine what kind of substance is in the water, Piringer said.

-- Clarence Williams