The person of interest in the Maine mass shooting, Robert Card, has been an Army reservist since December 2002, the Army said.

He has no combat deployments, the Army said.

His current rank is sergeant first class. His job is listed as petroleum supply specialist.

The police chief in Lisbon, Maine, told reporters Thursday that no tip is too small in the hunt for Robert Carr, the person of interest in the Lewiston, Maine, mass shooting.

Lisbon borders Lewiston and is where authorities are searching for the person of interest.

The white Subaru believed to be linked to the person of interest was found in Lisbon.

"If you see something in Lisbon, that is suspicious, I want you to call," Chief Ryan McGee said.

The chief said that police had responses from agencies all across the state and their federal partners.

He said he sent every one of his available officers to the neighboring community before the situation came to Lisbon.

-ABC News' Luke Barr

Municipal offices in Lewiston and Lisbon, Maine, will be closed on Thursday, officials said.

In Lewiston, where the mass shooting occurred, officials said they would also close the library and cancel all events, including early voting, at city buildings.

"Non-emergency personnel should stay at home tomorrow too," the city said in a social media post.

The nearby town of Lisbon, where police sources said the person of interest's Subaru had been traced, also closed municipal buildings on Thursday.

"Please prioritize safety and continue to shelter in place," Lisbon officials said in a notice on the town website.

At least 16 people are believed to be dead, though that number is in flux, and dozens more have been injured after a bowling alley came under fire in Lewiston, Maine, Wednesday evening -- the deadliest shooting of the year and one of the deadliest in recent decades.

Riley Dumont said she heard a loud bang after which her father, a retired cop, corralled them into a corner and put protection in front of them including "tables and a big bench that the kids were hiding behind."

“I was laying on top of my daughter. My mother was laying on top of me,” said Dumont. "It felt like it lasted a lifetime," she added. "I just remember people sobbing and crying."

Another witness at the bowling alley, whose name is Brandon, but whose last name was not made available, described hearing a "loud pop."

"Thought it was a balloon," Brandon said. "I had my back turned to the door. As soon as I turned and saw that it was not a balloon, he was holding a weapon. I just bucked it down the lane and I slid basically into where the pins are and climbed up to the machine and was on top of the machines for about 10 minutes until the cops got there."

Meghan Hutchinson, another shooting witness, said, "We were very scared and we didn't know, like, we didn't know what to do, what to expect from this. You know, nothing like this has ever happened here before. We barricaded in there and another parent was in the room with me. She had a phone and she called 911."

Zoe Levesque, 10, was grazed by a bullet.

“I never thought I'd grow up and get a bullet in my leg," said Levesque. "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?"

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