A 21-year-old Portland man was arrested Tuesday on accusations that he fired a gun into a neighbor’s condominium.

Matthew Morris, 21, was arrested on a charge of reckless conduct with a dangerous weapon, a Class C offense.

He was arrested at 87 Glenridge Road after officers investigated a report of a bullet hole discovered in a condominium on that street. Police determined that one round had been fired from a neighboring unit sometime Monday night that penetrated a living room wall. An adult was sleeping in the room at the time. No one was injured, but the bullet damaged items in the residence. The resident discovered the damage about 8:30 a.m. Tuesday.

Initial investigation indicates the round may have been fired negligently late Monday or early Tuesday morning. It was not reported to police at the time and no apparent effort was made to check the well-being of the occupants next door.

The police department is reminding the public to store firearms safely, follow safe handling procedures and always assume a gun is loaded. People should never handle firearms while impaired by medication, narcotics or alcohol. Firearms should always be locked and ammunition stored in a separate location.

Police are encouraging anyone who may have witnessed or has information about the incident to contact the detective division at 207-874-8533.