More than two days after a Maine man was killed in a road rage incident in Pennsylvania, police said Monday that they had no new information on who killed him or what may have led to the shooting on a rural stretch of highway.

Authorities have scheduled a news conference Tuesday to discuss the case, but would not say whether they had identified a suspect or whether the public was in danger.

Pennsylvania State Police say Timothy “Asti” Davison, 28, of Poland was shot to death in a random act of road rage early Saturday in south-central Pennsylvania, near the Maryland state line.

Davison had called 911 in Maryland and again when he crossed into Pennsylvania to say that he was being pursued and shot at by someone in a small, dark-colored pickup truck.

Trooper Rob Hicks said Monday that police are still investigating a possible connection between that attack and a shooting Friday night in Monaghan Township, Pa., where the driver of a black Nissan pickup truck allegedly fired shots at another vehicle. No one was injured in that shooting, which occurred about 30 miles from the site of the fatal shooting in Antrim Township, but a bullet hit near the driver’s side headrest.

Police have not disclosed how many shots were fired in either incident, what type of gun was used or exactly what Davison said in his calls to 911.

The FBI has joined the investigation, Hicks said, but he would not specify in what capacity.

On Monday, the Portland Press Herald asked police in Maryland and Pennsylvania to provide transcripts of Davison’s 911 calls.

Maryland authorities said they are still deciding whether to release the brief 911 call that Davison made before he crossed into Pennsylvania. Bardona Woods, director of communications for Washington County Emergency Communications in Maryland, said the decision on whether to release the transcript will be made Tuesday in conjunction with Pennsylvania State Police.

Pennsylvania authorities did not immediately respond to the public records request for the 911 calls, but said they are rarely released during an open investigation.

An autopsy on Davison was scheduled Monday at Lehigh Valley Hospital-Cedar Crest in Allentown, Pa. Results were not available Monday night.

Davison, who worked for his father’s business, Engineered Construction Services in Raymond, was on his way home from visiting his sister in Orlando, Fla., when he was shot.

Theresa Allocca, Davison’s mother, said the family “hasn’t heard anything more” from police. She said the family has not begun making arrangements for her son’s funeral, but she expects a large turnout because her son had many friends.

Davison, a graduate of Poland Regional High School, was an avid outdoorsman and a gifted mechanic who was rebuilding an antique vehicle, his family said. His mother said he was tall and athletic, and enjoyed “mudding” and canoeing.

No federal agency keeps statistics on road-rage incidents, including deaths. The U.S. Centers for Disease Control and Prevention tracks violent deaths by state but does not have a category for road-rage deaths.

There also is no current reliable research on road rage.

The AAA Foundation for Traffic Safety analyzed police reports of more than 10,000 road-rage incidents from 1990 to 1996 and found 218 murders.

According to the Governor’s Highway Safety Association, 15 states have laws defining aggressive driving. Maryland and Pennsylvania have laws regarding aggressive driving; Maine does not.

The association does not have a list of states that define road rage in statute, but two states passed laws recently – New Jersey in 2012 and Florida last year – making road rage a more serious crime.

Crimes of reckless driving, criminal threatening, assault or harassment could apply to road-rage incidents, depending on the investigating agency.

Pennsylvania has cracked down on aggressive drivers in recent years. In 2010, police issued more than 150,000 traffic tickets for aggressive driving.

Notable incidents in 2013 include:

An Ohio man was sentenced in April to life in prison for stomping a man to death in 2011. William Armstrong, 33, was a passenger in a car that was clipped in traffic by a vehicle driven by 68-year-old Wilmon Damron. The cars stopped, and Damron got out to apologize. Armstrong attacked him, inflicting internal injuries that triggered a stroke, causing Damron’s death three days later.

A New Jersey police detective was indicted on a murder charge in July in the shooting death of a driver in Maryland.

A Vermont man left his home distraught after fighting with his wife in September and went for a drive with a gun, intending to kill himself. Instead, he shot a stranger who he said charged at him after a confrontation in St. Albans.

Maine has not had any fatal road-rage incidents, but there have been cases involving drivers confronting others, including an incident in September in which police seized a pistol from Robert Getchell, a firearms instructor from Farmingdale, after he allegedly flashed the gun to two women who challenged his driving skills.

In October, police arrested a Hallowell man who allegedly pointed a loaded rifle at a motorist in Prospect.

And in April, Cumberland County sheriff’s deputies investigated an incident involving a car and a motorcycle on Route 25 in Gorham. The driver of the car ended the dispute by pulling alongside the motorcycle and knocking it and its driver to the ground.

Gillian Graham can be contacted at 791-6315 or at:

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Twitter: @grahamgillian