Police say that a non-injury shooting incident outside of a factory in Seymour, Indiana, was triggered by a driver’s frustration with a late load.

The incident was reported yesterday around 4 a.m. at the RR Donnelley printing plant, according to The Tribune.

Police were called to printing plant after an employee reported to a manager about hearing several shots fired outside of the facility. The gunfire “wasn’t close enough to cause a panic, but it was close enough to cause concern,” according to Seymour Police Chief Bill Abbott.

When police arrived on the scene and reported to the area where the shots were heard, they found one semi truck, two co-drivers, three handguns, and a spent shell casing. Investigators said that several shots had been fired into the ground on the south side of the facility.

No injuries were reported.

Both truck drivers denied firing a gun. However, after interviewing the drivers, police believe that the shots were fired because of frustration caused by a delay in picking up a scheduled load.

Police sent the shell casings and firearms to the lab to try to determine which of the drivers pulled the trigger. No arrests have been made at this time, but charges could follow.