An extensive manhunt is underway for a suspect in a mass shooting at a bowling alley and at a restaurant in Lewiston, Maine, on Wednesday night that left 18 people dead and 13 others injured and wounded, Gov. Janet Mills said Thursday.

An arrest warrant has been issued for Robert Card, 40, accusing him of multiple counts of murder, Maine State Police Col. William Ross said during a Thursday news conference. He “should be considered armed and dangerous,” officials said.

Of the 18 victims in Lewiston, seven were found dead at the bowling alley Just-In-Time Recreation and eight were found dead at Schemengees Bar & Grille, while three others died at the hospital, Ross said.

Over 350 law enforcement personnel are involved in the search for Card, officials told CNN.

Some in the area woke up Thursday to officers with long guns scouring their neighborhoods.

The Coast Guard sent out a patrol boat Thursday morning along the river but after hours of searching, they found “nothing out of the ordinary,” Chief Petty Officer Ryan Smith, who is in charge of the Coast Guard’s Boothbay Harbor Station, told the Associated Press.

Card’s car had been discovered by a boat launch near the Androscoggin River, which connects to the Kennebec, and Card’s 15-foot (4.5-meter) boat remains unaccounted for, Smith said. But he added that officials didn’t have any specific intelligence that Card might have escaped aboard his boat. “We’re just doing our due diligence,” he said.

Card is a certified firearms instructor and a member of the US Army Reserves, law enforcement officials in Maine told CNN. He had recently threatened to carry out a shooting at a National Guard facility in Saco, Maine, and reported mental health issues, including hearing voices, the officials said.

A U.S. official said Card was training with the Army Reserve’s 3rd Battalion, 304th Infantry Regiment in West Point, New York, when commanders became concerned about him.

State police took Card to the Keller Army Community Hospital at West Point for evaluation, according to the official, who was not authorized to publicly discuss the information and spoke to The Associated Press on condition of anonymity.