Yonathan Melaku, 22, of Alexandria, Va., is being investigated in 2010 shootings at military buildings.
The Associated Press reports Melaku, a Marine reservist, is being investigated in the shootings but has not been charged. Two shootings occurred at the Marine Corps museum, one targeted the Pentagon, and another incident happened at the Marine recruiting station. FBI linked the shootings, saying that the weapon matches in all cases.
Friday morning a bomb squad from the Arlington County Fire Department investigated a suspicious vehicle parked near the Pentagon. Melaku was detained after being spotted with a suspicious backpack. Authorities say the items were not explosive.
Melaku was held without bond and faced charges unrelated to the Pentagon investigation. He made a court appearance Monday for grand larceny charges from a previous case.