Maine Shooting Suspect's Vehicle Was Found Near Boat Launch Wednesday — and Divers Will Search River

Eighteen people were killed and 13 were injured during Wednesday night's mass shootings in Lewiston, Maine

Law enforcement searching for the suspect in Wednesday's mass shootings in Maine will search the Androscoggin River, close to where the suspect's vehicle was found, Mike Sauschuck, Public Safety Commissioner for the Governor's Office, said at a Friday press conference.

Sauschuck said authorities don't know where the suspect, identified as Robert Card, is, or whether he's dead or alive.

He said the suspect's vehicle was found by a boat launch along the river in Lisbon, and said the Maine State Police dive team will search the river.

Sauschuck added that the suspect left a note at his residence, but he did not provide details on the note.

Eighteen people were killed and 13 were injured during the shootings, which took place at Just-In-Time Recreation, a bowling alley, and Schemengees Bar and Grille, about four miles away.

The suspect was described by Governor Janet Mills as being "armed and dangerous." He remained at large Thursday afternoon, as a shelter in place issued earlier by the Maine Department of Public Safety was extended. He has been charged with multiple counts of murder.

The suspect is a Petroleum Supply Specialist in the U.S. Army Reserve, Army Spokesman Bryce Dubee tells PEOPLE.

Related: 18 People Killed, 13 Injured in Maine Mass Shootings, Manhunt for Suspect Ongoing: Governor

The Associated Press, citing a state police bulletin, reports the suspect had recently been committed to a mental health facility for two weeks this past summer.

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Related: Maine Woman Says Sister Was Calling 911 as She Was Fatally Shot in Bowling Alley: 'She's a Hero'

According to the bulletin, the suspect had threatened to perpetrate a shooting at a military base in Saco, Maine. The bulletin also says the suspect had said he'd heard voices.

Lewiston has a population of about 38,500, and is the second-most populous city in the state after Portland, which sits about 35 miles to the south. It's the home of Bates College and the Dempsey Center, founded by actor Patrick Dempsey to provide support for people afflicted with ovarian cancer.

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