Workers affiliated with the Teamsters began striking at Amazon facilities across the country Thursday morning -- in what the union calls the largest strike in history against the online shopping giant less than a week before Christmas.
In a news release Thursday evening, the union said "thousands of Teamsters" were taking part in the strikes at facilities in New York City, Atlanta, Southern California, San Francisco and Illinois, but did not provide specific numbers. Later, the union said Teamsters President Sean O'Brien would join striking members at a facility in the City of Industry, California, on Friday as the strike was set to enter its second day.
In addition, the Teamsters said local unions were also picketing "hundreds" of Amazon Fulfillment Centers nationwide.
MORE: Amazon strike could lead to delays in delivery of holiday giftsAmazon said the strike was not expected to impact operations and claimed the strikes were being attended by outside organizers.
“What you see here are almost entirely outsiders—not Amazon employees or partners—and the suggestion otherwise is just another lie from the Teamsters," an Amazon spokesperson said in a emailed statement a few hours after the strikes began Thursday morning. "The truth is that they were unable to get enough support from our employees and partners and have brought in outsiders to come and harass and intimidate our team, which is inappropriate and dangerous. We appreciate all our team’s great work to serve their customers and communities, and are continuing to focus on getting customers their holiday orders.”
Overall, nearly 9,000 Amazon workers, across 20 bargaining units, have affiliated with the powerful International Brotherhood of Teamsters, the union said. The striking workers represent less than 1% of the company's 1.5 million employees worldwide, including 800,000 in the United States.
MORE: Amazon workers authorize strike at company's first-ever unionized warehouseThe Teamsters, announcing the move earlier this week, billed it as the "largest strike against Amazon in U.S. history" and said it came after Amazon refused to bargain with workers organized with the Teamsters.
The union said workers are picketing for higher wages, improved benefits and safer work conditions.
"If your package is delayed during the holidays, you can blame Amazon's insatiable greed," O'Brien said in a statement Thursday announcing the strike. "We gave Amazon a clear deadline to come to the table and do right by our members. They ignored it."
In a statement to ABC News, an Amazon spokesperson said the Teamsters illegally coerced workers to join the union.
"For more than a year now, the Teamsters have continued to intentionally mislead the public – claiming that they represent 'thousands of Amazon employees and drivers'. They don't, and this is another attempt to push a false narrative," Amazon spokesperson Kelly Nantel said in a statement Thursday. "The truth is that the Teamsters have actively threatened, intimidated, and attempted to coerce Amazon employees and third-party drivers to join them, which is illegal and is the subject of multiple pending unfair labor practice charges against the union."
The spokesperson said the company has increased the starting minimum wage for workers in fulfillment centers and transportation employees by 20% and in September increased average base wage to $22 per hour.
The announced strike by the Teamsters comes after workers at several Amazon facilities authorized the walkout.
The facility in New York City's Staten Island was Amazon's first-ever unionized warehouse. Workers there have said the company has refused to recognize the union and negotiate a contract after workers there voted to unionize in 2022.
The National Labor Relations Board officially certified the union representing workers at the facility, but Amazon has appealed that ruling.