The union representing Safeway store employees in Colorado has given the required 72-hour notice that the strike is set to begin one minute before midnight on Sunday.

So far, striking is limited to Estes Park, Fountain, Pueblo and a Denver distribution center after UCFW 7 members did not reach an agreement with Safeway/Albertsons.

Workers at stores in metro Denver and other parts of Colorado could hit picket lines as early as Sunday morning.