Two police officers and a Tennessee Highway Patrol officer were inside the building in Robertson County conducting a training exercise when the bombs went off at 1:30 a.m., according to a news release.
No one was injured and there are no suspects.
The Fire Marshall and police requested the help of the Tennessee Bureau of Investigation, Alcohol Tobacco and Firearms and Tennessee Highway Patrol.
Officials are investigating whether this explosion, is related to a similar incident on the 200 block of Orchard Park in White House on July 26.
ETA: The news article has been updated, and the update is posted in the comments. Police believe the THP officer is being targeted.