BARCELONA, Spain—Overwhelmed authorities on the Canary Islands are asking Spain’s government for help amid rising tensions between migrants and police at a crowded, makeshift tent camp for a steady stream of arrivals from West Africa.
Nearly 2,000 migrants live in the facility designed to shelter 400 people on a pier on the island of Gran Canaria, part of the Atlantic archipelago that’s at the end of the busiest—and deadliest—route for those risking their lives to reach Europe by sea.





