Washington (CNN) The FBI has taken custody of multiple suspicious packages sent to military locations and the CIA in the Washington, DC area, officials said Monday.

They said packages were sent to the CIA, Fort Belvoir and Fort McNair. A US official said a Naval Support Facility in Dahlgren, Virginia, also received a suspicious package and that the FBI is leading the investigation.

A law enforcement official told CNN there were more than 10 devices. All were very crude, involving black powder, and would not have caused fatalities had they gone off, the official said.

At least one package, sent to the National Defense University at Fort McNair in Washington, DC, contained explosive material and was ultimately rendered safe. That package arrived at 8:30 a.m. ET and the building was evacuated immediately, according to Army spokesman Michael L. Howard.

"At 12:10 p.m., 52nd Army Explosive Ordnance Disposal from Fort Belvoir, VA, confirmed the package tested positive for black powder and residue," Howard said in a statement. "The X-ray conducted indicates suspected GPS and an expedient fuse were attached. The package was rendered safe. No injuries are reported."

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