"The fish plant incurred significant damage, it was not occupied at the time and no employees were injured, a man is in hospital with life-threatening injuries believed related to the fire", the police said in a statement Saturday.
Nova Scotia Health says it is contacting anyone else known to be a close contact of the person (s) confirmed to have COVID-19.
Nova Scotia Premier Stephen McNeil is urging Ottawa to define what constitutes legal harvesting in a "moderate livelihood" fishery, after a dispute about Indigenous fishing treaty rights boiled over this weekend. Under Nova Scotia's Health Protection Act order, visitors from other Canadian provinces and territories must self-isolate for 14 days.
Chief Mike Sack of the Sipekne'katik First Nation issued a statement saying the overnight blaze "further illustrates the need for greater police presence in the region". "We're focused on keeping people safe".
The two clashes earlier in the week involved hundreds of people outside lobster pounds that handle Indigenous-caught lobster. "The threats, violence, and intimidation have to stop".
He also called out Prime Minister Justin Trudeau for not doing enough.
"There was no hope of saving it", LeBlanc said of the building, noting it was engulfed in flames when fire crews arrived and the wind was stoking the embers.
LeBlanc said it's still too early to identify the cause of the blaze, but the fire marshal's office is investigating.
Tense confrontations have taken place during the past several weeks between commercial and Indigenous fishers in Nova Scotia, who are exerting their right to fish outside Canada's federally regulated fishing season.
But Sack argues Indigenous people in Atlantic Canada and Quebec have a treaty right to fish for a moderate livelihood where and when they want, based on a 1999 Supreme Court of Canada decision that cites treaties signed by the Crown in the 1700s.
Many non-Indigenous critics, however, cite a clarification issued four months after the 1999 ruling, stating the Mi'kmaq treaty rights would be subject to federal regulations to ensure fish conservation.
On Twitter Saturday, Assembly of First Nations National Chief Perry Bellegarde said he's reached out to the RCMP and the federal government to express First Nations' "deep concern" over the fire.
A man has been charged in relation to an assault on Chief Sack on October 14, the RCMP also said on Saturday.
Canada's public safety minister, Bill Blair, said he was "confident the unacceptable acts of violence will be thoroughly investigated and the perpetrators will be held to account".