San Francisco teachers strike leaves 50,000 students out of class as educators demand better wages and health benefits amid the city's high living costs.

Feb. 9 (UPI) -- Schools closed as teachers in San Francisco began a strike Monday after struggling to come to an agreement with the school district over pay and health care costs.

The strike closed public schools for more than 50,000 students in the city and had no end date. Health care costs are a key issue in negotiations.