Police will continue conducting increased patrols in two Aroostook County towns after two men were found shot to death in a pickup truck early Tuesday.

The stepped-up police presence in Castle Hill and Mapleton will continue through the weekend, according to Stephen McCausland, spokesman for the Maine State Police.

Detectives and technicians continue to gather evidence and conduct interviews in the slayings.

Police found the bodies of 51-year-old Roger Ellis and 25-year-old Allen Curtis along Route 227 in the town of Castle Hill. They had been shot to death. Police say the perpetrator of the crime remains at large.

Agencies involved in the investigation include the Maine State Police, the Aroostook County Sheriff’s Office and the police departments of Presque Isle, Caribou, Limestone and Ashland. Maine Drug Enforcement agents and the Maine Warden Service have also been involved in the case, McCausland said in a statement on Friday.

Residents who have concerns or information are asked to call the State Police offices in Houlton at 207-532-5400.

The Aroostook County Crimestoppers, a regional public safety nonprofit, is offering $2,000 for information that leads to an arrest and prosecution for the homicides, police said Saturday.