Police arrested Christopher Phillips, 42, on suspicion of carrying two dangerous chemicals from Nova Scotia to Ottawa.
Dangerous chemicals found at the cottage in Grand Desert led officials to evacuate five nearby homes on Wednesday.
RCMP said Grand Desert residents can travel through the area on Old Dyke Road "under RCMP direction."
Dave Croft, who lives near the cottage in Grand Desert, said Phillips struck him as odd.
“He said that he was using it for storage,” he said. “It seemed odd because most Americans that come up here come up here for the view, and to use cottages for what cottages are used for, right? And they’re really nice, but this guy wasn’t so nice.”
Nova Scotia investigators are on their way Ottawa to interview Phillips.
At 2 p.m. AT, police will provide an update on the situation and when residents forced out of their Nova Scotia homes can return.