Striking workers at 77 King Soopers stores in Denver and its suburbs, plus those in nearby Boulder and Louisville, Colorado, urged customers not to cross picket lines that began taking shape before dawn.

King Soopers union members established picket lines at 77 grocery stores throughout the Denver metro area Thursday to protest unfair labor practices. State of play: The labor dispute is expected to last two weeks and affect about 10,

The strike will affect 77 stores in Adams, Arapahoe, Broomfield, Denver, Douglas and Jefferson counties, as well as in Boulder and Louisville.