Members of the Teamsters union have voted to authorize a strike at three Amazon facilities, including at the Staten Island, New York, warehouse which became the first location where employees voted to join a union in 2022.

Amazon.com union members at another U.S. facility voted to authorize a strike, becoming the third to do so in less than a week as tensions with the e-commerce giant expand across the country over contract negotiations.

Workers at a Staten Island, New York Amazon warehouse voted on Friday to authorize a strike if the company doesn’t agree to set dates for contract negotiations. The workers are asking Amazon to recognize the union and bargain for safer working conditions and better wages,