Day Kimball Hospital in Putnam was on lockdown and a shelter-in-place was issued after unfounded reports of a man with a possible handgun in front of the hospital, according to state police.
Police said a handgun was seen holstered to a man, however, it was never seen in his hand or displayed.
The lockdown has been lifted.
Officials from the hospital said there was a report of a suspicious male outside the emergency room with a backpack that some type of gun was visible from around 1:30 p.m. The "active shooter" code was called out at the hospital and it was immediately placed in lockdown.
State troopers checked the hospital, schools and surrounded area and found nothing.
Ambulances transporting patients to Day Kimball were diverted to other hospitals soon after the incident was reported, according to Quinebaug Valley Emergency Communications.
Schools went into lockdown for around 10 minutes.