Gates at Joint Base Pearl Harbor Hickam are back open Wednesday morning after reports of an alleged bomb threat.

Officials say, a car that did not have authorized access drove up to the base around 10:30 Tuesday night. A guard noticed the smell of drugs and saw potential ordnance in the car.

Military authorities ended up finding a ten inch mortar inside. The mortar had a live fuse, meaning it had a live round. It was an unearthed training round, which can still injure someone, but has no large blast radius.

Three vehicle occupants -- civilians with no military affiliation -- were taken into custody by Naval Criminal Investigative Service (NCIS), and were cited for trespassing of a military installation. All three have since been released.

Officials say it's unclear whether they were trying to get on base, or just took a wrong turn.