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Colorado Police Hunting for Highway Shooter Release Pickup Truck Sketch

The truck is a 1970s full-sized, single cab Chevrolet or GMC pickup, faded orange in color with a full-sized bed, Larimer County officials said.

This is a wanted pick-up truck.

Authorities in northern Colorado investigating a string of fatal roadside shootings have released a sketch of a "vehicle of interest" that may have been involved in some of the attacks.

The truck is a 1970s full-sized, single cab Chevrolet or GMC pickup, faded orange in color with a full-sized bed, Larimer County officials said in a news release Tuesday. There is also black primer on the driver's side of the truck.

Related: Is Serial Shooter on the Loose in Colorado?

A multi-agency task force that formed to investigate recent shooting incidents in Northern Colorado released this sketch of a vehicle of interest.David Moore / Larimer County Sheriff

The description was given after a person said they were shot at on June 3 in Loveland — the same community north of Denver where a 65-year-old man was fatally struck on a sidewalk near his home that same day. The person who gave the description was uninjured, police said.

"Investigators believe it is likely these two incidents are related and is seeking information about this vehicle of interest," officials said in the news release.

Related: John Jacoby Fatally Shot While Cycling in Windsor, Colorado

A multi-agency task force is trying to determine why someone appears to be randomly shooting at people and have raised fears that a serial shooter could be on the loose.

The shootings in Loveland, however, have not been specifically linked to two earlier shootings, authorities said. On April 22, a driver on Interstate 25 was shot in the neck and survived. Nearly a month later, a 48-year-old bicyclist was struck on a rural road in Windsor. The shootings took place about 15 miles apart and remain unsolved.

Related: Colorado Hunting for Shooter Who Killed Cyclist, Injured Driver in Two Attacks

Other drivers have reported shattered windshields in the area, although authorities have said they were likely caused by road debris, not bullets.

Nebraska woman Donna Sharp said she was on Interstate 25 in late April when something hit her rental car near the driver's side window.

Donna Sharp says her rental car was hit by a bullet while driving on a Larimer County, Colorado, highway on April 25.Donna Sharp

"When I heard it, it was metal on metal," Sharp told NBC News last week. "I kind of went into shock."

When she looked around, she didn't see any other car, but is convinced the quarter-inch dent came from a bullet and not random debris.

"I feel blessed not to have gotten hit," Sharp added.

David Moore, spokesman for the Larimer County Sheriff's Office, could not immediately confirm the incident involving Sharp, but said "there has been no evidence found in any of the shattered windows incidents to indicate they were broken by a bullet."

The FBI is offering a reward of up to $20,000 for information leading to an arrest in the shootings.