WASHINGTON (TNND) — After a nearly five-year investigation, police have arrested Brian Cole Jr., a 30-year-old Virginia resident, as the suspect in the planting of pipe bombs in Washington, D.C., on Jan. 6. Investigators revealed that a search of Cole's residence uncovered materials for making pipe bombs.

The FBI has arrested a suspect five years after an unidentified person placed two pipe bombs outside the headquarters of the Republican and Democratic national parties in Washington, D.C.

The arrest of Brian Cole Jr., 30, of Woodbridge, Va., is the first time the Justice Department named a suspect in the long-running investigation into the devices, which confounded investigators for ye...