The facility, at 51 Mountview Ave., in Nyack, was evacuated around 2:53 p.m. Friday after a report of a suspicious device, said Clarkstown Officer Peter Walker.
An extensive search of the building was conducted and one training hand grenade and one metal hand grenade were found in the refrigerator of a 91-year-old male resident who is currently out of the facility for medical treatment, Walker said.
A cautionary sweep of the resident's vehicle was also conducted and no other devices were found, he added.
The Rockland County Sheriff's Bomb Squad removed the two devices and they will X-ray the devices to see if they are "live" grenades, Walker said.
"They appear to be World War II-era devices. All residents have been returned to the home and the incident is all clear at this time," Walker said.
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