The decision by the United Food and Commercial Workers to authorize an unfair labor practice strike against San Bernardino-based Stater Bros. comes two weeks after the region’s largest grocery workers’ union agreed to a new a three-year contract with Boise, Idaho-based Albertsons Cos. and Cincinnati-based Kroger Cos.

Before an agreement was reached, grocery workers across Northern and Central California prepared to strike starting on Saturday at 12:01 a.m. Union officials Saturday morning announced that the deadline for an agreement had been extended and delayed the proposed strike by 24 hours to Sunday at 12:01 a.m.

Local union representatives from United Food and Commercial Workers announced a tentative agreement Sunday with Albertsons Companies amid a planned strike of nearly 25,000 employees.• Video Above: A Brief History of the Federal Minimum Wage Albertsons Companies is the parent company of Safeway and Vons grocery stores.