Maine shooting: New details emerge in Robert Card's death

The shooting unfolded in part during youth night at a local bowling alley. Witnesses described a desperate scene where people hid behind benches and tables and even inside the bowling pin machine at the end of a lane.

Meghan Hutchinson, who was at the bowling alley with her daughter said, "When I turned around, I saw the shooter. ... I don't know if that was just a warning shot or if he shot somebody with that [bullet]."

"Between the lanes there's some swinging doors where they keep all the mechanical stuff out back, so we kind of all just ran that way," she said. "We barricaded in there and another parent was in the room with me. She had a phone, she called 911."

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Security measures in place for victims in hospital after Maine mass shooting

ABC News' Trevor Ault is at the Central Maine Medical Center where many of the injured in the Lewiston mass shooting are being treated.

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Her daughter, 10-year-old Zoey Levesque, was grazed by a bullet.

"I never thought I'd grow up and get a bullet in my leg," she said. "Like, why do people do this? I was more worried about, like, am I going to live and going to make it out of here? Like, what's going to happen? Are the cops going to come?"

The family of mass shooting suspect Robert Card is cooperating with authorities, law enforcement officials briefed on the investigation told ABC News.

The family is laying out an account of a deeply troubled person, the sources said, bolstering earlier accounts of mental health treatment, voices in his head and alleged threats to shoot up a National Guard facility.

Card's sister told investigators she thought Card might have been looking for an ex-girlfriend at the shooting locations: a bowling alley and a bar, the sources said.

The U.S. Coast Guard is searching the Kennebec River in Maine for any sign of the mass shooting suspect, Robert Card.

Card owns a boat and property in the Lewiston area, according to a source briefed on the situation.

"Currently, one response boat crew from Station Boothbay Harbor, and an Air Station Cape Cod HC-144 fixed wing aircraft are assisting with patrols," Coast Guard spokesperson Rob Simpson said in a statement.

Maine mass shooting suspect Robert Card allegedly behaved erratically this summer while serving as an Army reservist, according to a defense official.

Card was deployed to Camp Smith Training Center in upstate New York to help support summer training for West Point cadets.

Card allegedly threatened other soldiers with violence, according to a source briefed on the situation.

"Out of concern for his safety, the unit requested that law enforcement be contacted," the defense official said. Police took Card to Keller Army Community Hospital at the United States Military Academy for a medical evaluation, the official said.

Sometimes this spring or summer, Card bought an accessory to a firearm, according to the source briefed on the situation.

With the manhunt for Card ongoing, the source noted that Card owns a boat and property in the Lewiston area.

-ABC News' Luis Martinez and Pierre Thomas