Thousands of Amazon workers have ended their days-long strike against the company, according to the Teamsters union. But tensions persist, with the union saying its efforts aren’t over.

Amazon workers have walked off the job at seven facilities throughout the U.S., including the company's Queens location in New York City, as they push for contract talks with their union.

The International Brotherhood of Teamsters said workers at seven Amazon facilities will begin a strike on Thursday morning.

The Teamsters union announced late Friday that warehouse workers at a massive Amazon sorting and distribution center in Staten Island, New York, have joined the thousands of union members who began a strike this week against the online retail giant.

Amazon workers in several cities nationwide have walked off the job, initiating what the Teamsters labor union calls the “largest strike” against the online retail titan less than a week before Christmas.