A Greenwood, N.S., man barricaded himself inside his home over the weekend and RCMP said he might be armed.
Officers from the Kings District RCMP were called to the house on Hall Road at 7:25 p.m. Saturday and remained there as of Sunday evening.
The CBC's Michael Dick said police have blocked off several kilometres of roads around the home, which is in a remote location. Nearby homes have been evacuated.
Police said those are precautionary measures.
"Kings RCMP received a call about an emotionally disturbed adult man claiming to have firearms at his residence," Sgt. Alain LeBlanc said Sunday.
"Initial police interactions with the man were unsuccessful and in the interest of public safety, several nearby homes were evacuated."
Police trained in crisis intervention are speaking with the man. He is alone.
LeBlanc is asking people to stay away from the area until the situation is resolved.
"Our primary concern is public safety," he said. "We just don't want to take chances. Whenever firearms are involved, there is a risk to public safety."
When reached Sunday evening, police said the standoff and accompanying evacuation of homes could last several more hours.
Hall Road is just behind Canadian Forces Base Greenwood in the Annapolis Valley community.