LINCOLN, Maine — A Public Works Department laborer resigned from his job Friday after being charged with hitting a fellow worker in the groin with a tool while both were working at the town garage last month, officials said Tuesday.

Peter Bates, 34, of Enfield was issued a summons Friday charging him with Class B aggravated assault. The case will be referred to the Penobscot County District Attorney’s Office and a grand jury. More charges might result, said Dan Summers, Lincoln’s director of public safety.

Bates’ resignation followed the issuance of the summons, Town Manager Ron Weatherbee said.

The incident, which occurred on March 11, resulted in the 32-year-old male victim suffering enough injury to require a followup visit to Penobscot Valley Hospital of Lincoln, Summers said.

Summers said that from Bates’ perspective, the incident might have been “a prank that got out of hand.”

“He might have thought he was being reckless in his joking,” Summers said Tuesday. “Obviously, it is not something we condone.”

The incident was reported to Bates’ supervisor on March 23. The police investigation began two days later, said Steve Clay, Town Council chairman. He complimented police for doing good work very quickly.

The council had an emergency meeting in executive session on Monday in which councilors were briefed on the incident and reviewed how town supervisors handled it, said Clay, who described the incident as a personnel matter.

Bates is due to appear at the Penobscot Judicial Center in Bangor on June 11, Summers said.