KENNESAW, Ga. — It was before sunrise when the young man drove to the FedEx package-sorting center where he worked outside Atlanta, armed with a shotgun and Molotov cocktails. At 5:54 a.m. Tuesday, police said, Geddy Kramer opened fire on a guard at the entrance to the business.

When he emerged from his car, a witness said, he had ammunition draped across his chest “like Rambo.” He shot more people inside the sprawling warehouse, police said, sending other co-workers scattering as gunfire rang out. One man injured himself trying to flee.

Kramer then made his way to a trailer where he killed himself, ending the rampage. Police declined to say what his motive was, but the explosive devices indicate his destructive intentions. The explosives weren’t used and all six victims survived their wounds.

The suspect, identified by police as Kramer, 19 of Acworth, worked as a package handler at the sprawling facility

Three of the victims were critically wounded, though only one remained in critical condition by late Tuesday afternoon.