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HARRISBURG, Pa. — State police have released a video in connection with the apparent road-rage slaying of a Maine man along a Pennsylvania interstate four days into the new year.

Lt. Adam Kosheba, commander of the criminal investigation section in the Harrisburg barracks, said Thursday that the video was being released “not so much to focus on the suspect’s vehicle, but more so to identify possible witnesses. “

Timothy Davison, 28, was driving home to Poland on Interstate 81 early Jan. 4 when he was shot to death about 10 miles north of Hagerstown, Md. He had called 911 as he crossed into Pennsylvania to report that another driver was shooting at him, and police believe a pickup rammed Davison’s car into a grassy median before the driver or perhaps a passenger shot him, authorities said.

Investigators have said they believe the suspect vehicle and its driver were observed by several motorists along I-81 in Maryland, and possibly by other motorists after Davison’s vehicle veered into the median.

Kosheba said police believe several motorists saw the victim’s vehicle in the median and possibly vehicle occupied by Davison’s killer. The video shows “vehicles that were driving in that area during the time span of this incident,” Kosheba said in a statement.

Police said the video shows the suspect vehicle and other vehicles after the victim was run off the road and just before the fatal shots were fired.

State police are asking anyone who may have been in the area at the time and saw anything to contact them. Davison’s family and the Pennsylvania Crime Stoppers organization are each offering a $10,000 reward for information leading to the arrest and prosecution of the killer.