TORONTO (AP) — Canadian Prime Minister Justin Trudeau has asked that flags on all federal buildings be flown at half-staff in honor of more than 200 children whose remains have been found buried at what was once Canada’s largest Indigenous residential school. Mayors of communities across Ontario, including Toronto, Ottawa, Mississauga and Brampton, also ordered flags lowered to honor the children. Chief Rosanne Casimir of the Tk’emlups te Secwepemc First Nation in British Columbia says the remains of 215 children were confirmed last weekend with the help of ground-penetrating radar. From the 19th century until the 1970s, more than 150,000 First Nations children were required to attend state-funded Christian schools as part of a program to assimilate them into Canadian society.