The hospital confirmed via Twitter earlier in the afternoon that the campus was "locked down following reports of an active shooter in the hospital" and said officials were assessing the situation.
Latest: Dartmouth-Hitchcock Medical Center in Lebanon is now locked down following reports of an active shooter in the hospital.
Several witnesses driving along Interstate I-89 reported seeing heavy State Police presence at all exits.
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Absent Supreme Court action, the Ninth Circuit's decision is due to go into effect Tuesday. The Trump administration said it should not, meaning such refugees would be barred.
"Police are looking for a man described as 6'1" tall, with salt and pepper blonde hair, wearing a red camoflage shirt and may be carrying a camoflage backpack as well, according to Dartmouth College in neighboring Hanover. Minutes later police said a person was in custody.
A witness told TV station NBC5 that there was an active shooter on the fourth floor. Employees were asked to evacuate if they felt safe doing so. The local police also responded in mass. A code silver is a active shooter. The hospital urged those who could safely flee to do so and those who could not to shelter in place.
Dartmouth College, located about two miles away from the hospital, tweeted that its campus was not on lockdown.