MONTREAL—Quebec will bring back an 8 p.m. curfew in the Montreal area and extend a lockdown order in three cities and one region as it tightened COVID-19 restrictions Thursday for the second time in three days. Beginning Sunday, people in Montreal and its northern suburb of Laval will have to remain at home from 8 p.m. to 5 a.m. or face fines of more than $1,000, Premier Francois Legault said in Montreal. The curfew in that region currently starts at 9:30 p.m. Legault said he is imposing the health order on Montreal and Laval as a preventive measure despite the fact new, daily COVID-19 cases in the region have been stable. He said health officials are near-unanimous that the heavy presence of virus variants will soon cause cases to rise rapidly in the densely populated area. “Like many places in the world, we have to bring back restrictions,” Legault said, …