An explosive device went off on the train tracks near James Madison University at about 6:30 a.m. Thursday.
No one was hurt in the blast and terrorism is not suspected, according to Rich Marianos, a spokesman for the Bureau of Alcohol Tobacco and Firearm.
A resident of a nearby apartment complex called 911 to report a "possible explosion" near the tracks in Harrisonburg, Va., according to police. The ATF sent seven people to the scene, including two explosive experts. Police have confirmed that a freight train was "being moved" in the area of the blast at the time, according to the Daily News Record.
Investigators at the scene found evidence of the explosion along with debris on the tracks. The device was relatively small, according to officials.
Police and ATF officials have launched a criminal investigation.