LEBANON, N.H. (AP) — A Rhode Island resident was taken into custody Tuesday after police received a report of an active shooter inside the intensive care unit of New Hampshire's largest hospital, authorities said.

There has been no confirmation yet from authorities as to whether a shooting occurred.

Authorities said a person was taken into custody shortly before 3 p.m. while trying to leave the grounds of Dartmouth-Hitchcock Medical Center. The hospital was placed under lockdown and it wasn't clear if that was lifted.

Attorney General Gordon MacDonald said at a news conference that police had received a report of a shooting inside an ICU on the fourth floor of one of the buildings. He said the "incident" was now over and there was no threat to the public. He did not explain what he meant by "incident."

MacDonald, State Police Commander Christopher Wagner and hospital officials declined to answer questions after giving reporters a brief statement.

MacDonald said authorities expect to be able to provide further details Tuesday night.

Rhode Island State Police said the suspect's car had Rhode Island plates so police in New Hampshire reached out to the state's Fusion Center, an information center under the command of the state police that also involves representatives from local, state and federal agencies.

The center helped identify the suspect as a Rhode Island resident, said Laura Meade Kirk, a state police spokeswoman. The resident's name wasn't immediately released.

People were told to avoid the area around the hospital, and traffic was stopped on a route leading to the medical center.

The Bureau of Alcohol, Tobacco, Firearms and Explosives and Vermont State Police assisted New Hampshire and local police.

The state attorney general's office is investigating.