Secret Service investigating suspected cocaine found inside White House complex

The U.S. Secret Service on Tuesday said it was investigating an "unknown item" found inside the White House complex on Sunday that sources said was described in radio traffic as a cocaine-like substance.

"The DC fire department was called to evaluate and quickly determined the item to be non-hazardous. The item was sent for further evaluation and an investigation into the cause and manner of how it entered the White House is pending," he said.

Sources told ABC News radio traffic from D.C. Fire and EMS described a powdery, cocaine-like substance being found on the White House grounds and the preliminary results from an initial field test.

"We have a result on the [inaudible]" a voice on the traffic can be heard saying. "We have a yellow bar stating cocaine hydrochloride."

The powder was found in the West Wing area of the White House, multiple law enforcement sources told ABC News.

Some visitors are able to tour parts of the West Wing, and tours typically take place on the weekends.