Irate demonstrators burned tires and blocked traffic in eastern Afghanistan on Thursday after U.S.-led forces killed an armed relative of an Afghan lawmaker during a night raid on her home, according to military and Afghan officials.

The confrontation was another setback for the American-led military coalition in Afghanistan, which has declared an aim of reducing civilian deaths and winning support from skeptical Afghans as it prepares for a prolonged summer offensive meant to hobble the Taliban.