State and local police arrested one suspect Tuesday afternoon in connection with a Presque Isle shooting that critically injured a man Monday.

Police arrested Jomo White, 31, of Atlanta, Georgia, at a home Tuesday morning in Presque Isle, Maine State Police said.

But officers were still looking for 44-year-old Jason Alexander of Blaine, who is considered armed and dangerous.

The shooting happened around 5:47 a.m. Monday on the Northern Road in Presque Isle, and forced the closure or lock-down of area schools. The male victim, who has not been identified by police, underwent surgery at a local hospital before being transported by LifeFlight helicopter to Northern Light Eastern Maine Medical Center in Bangor.

The victim was initially listed in critical condition, but he improved overnight, said Steve McCausland, a spokesman for the Maine State Police.

“Although many schools and businesses were closed or locked down today, police are considering this an isolated incident and believe the victim and shooters knew each other. The public is asked to remain vigilant, but go about their normal daily routines,” police said in the news release.

Police are asking for the public’s help locating Alexander, who is described as white, 5-feet 9 inches tall, about 220 pounds, with brown hair and blue eyes.

Anyone who assists in locating Alexander may be eligible for a $500 reward. Anyone who assists Alexander in evading capture could be subject to prosecution, police said.

Several witnesses have been interviewed. Anyone who sees Alexander should contact the Maine State Police at 532-5400.

The incident comes less than a month after an unsolved double-killing in Castle Hill, about 10 miles from Presque Isle. State police say two people were fatally shot Aug. 13 in a pickup truck.