Edwards is participating in a NAACP forum Thursday.
WASHINGTON (CNN) – Former Sen. John Edwards’ presidential campaign headquarters in Chapel Hill, North Carolina, was evacuated late Thursday morning as police checked a suspicious package delivered to the office.
An Edwards spokesman told CNN they were evacuated “as a precaution” and said there was no known threat.
Aerial footage from CNN affiliate WTVD’s helicopter showed the bomb squad on the scene and a robot being moved towards the building. Bomb squad technicians could be seen putting on protective gear.
In a statement, Deputy Campaign Manager Jonathan Prince said, "We received a suspicious package at our campaign headquarters this morning. On the advice of the authorities, we evacuated the building and will continue to take every possible precaution”
Chapel Hill Police and the FBI were investigating.
Edwards was in Detroit, speaking at an NAACP forum during the situation.
Earlier this year, the office was evacuated twice after receiving letters containing white powder. Those packages tested negative for dangerous materials.
1:30 p.m. ET Update: CNN has learned police have allowed campaign staff back into the building.
4:15 p.m. ET Update: The suspicious package contained beeping watches according to Captain Bob Overton with the Chapel Hill Police Department. Special Agent Newsom Summerlin from the FBI field office in Charlotte said his office will not be initiating a criminal investigation.
– CNN's Steve Brusk and Cristy Lenz