Law enforcement authorities are investigating a suspicious substance found on the door of the Baltimore district office of U.S. Rep. Elijah Cummings.
Ian Brennan, a spokesman for the city fire department, said the department's hazardous materials unit was called to the office about 11:30 a.m. after someone noticed a suspicious, dark-colored material on the door. He said he wasn't aware of any note being left alongside the substance.
"When my staff arrived at my Baltimore City District office this morning, they found a putty-like substance on the outside of the front door," read a statement from Cummings.
Baltimore police advised Cummings's staff not to enter the office.
A bomb technician determined the substance was not explosive material and said there was not an active threat.
Police and the FBI are removing the substance from the door and collecting other evidence from the area before allowing Cummings's staff into the building.
Cummings, a Democrat, joined Congress in 1996 and is currently the ranking member of the Committee on Oversight and Government Reform.