King Soopers workers in Denver, Parker, Broomfield and Boulder moved to authorize an unfair labor practice strike during votes on Wednesday and Thursday.

Employees from 10 King Soopers stores in the Colorado Springs area voted Friday to authorize a strike against the grocer King Soopers, joining union employees in the Metro Denver area who also voted to strike on Thursday.

Unionized King Soopers workers in Broomfield and Boulder counties joined their peers in the Denver metro area to vote in favor of a strike authorization this week as the Kroger Co.-owned (NYSE: KR) grocery-store chain and the United Food and Commercial Workers Local 7 have failed to agree on terms for a new labor contract.

Both the president of King Soopers and the union that represents the supermarket chain’s employees believe a strike is likely after union negotiators rejected the company’s contract offer. That’s where the agreement ends.

King Soopers employees across metro Denver authorized a strike on January 30. Workers in Colorado Springs and Pueblo will consider doing the same this weekend.

The union workers of Kroger-owned King Soopers grocery stores in the metro Denver, Boulder, Parker and Broomfield bargaining units voted to authorize an unfair labor practice strike, the union

More grocery strikes could be planned at Kroger-owned stores in Colorado with bargaining units in Colorado Springs and Pueblo set to vote

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Pueblo and Colorado Springs workers vote next. UFCW Local 7 represents 12,000 King Soopers and City Market workers in Colorado.

Local 7 said on Thursday that King Soopers employees of Metro Denver, Boulder, Parker and Broomfield voted to approve a strike regarding alleged Unfair Labor Practices.

In the event of a strike, stores would remain open with assistance from temporary workers, King Soopers said in a statement