Amazon workers are striking at multiple delivery hubs. Here's what you should know

Amazon workers affiliated with the Teamsters union continued a strike Friday at seven of the company's delivery hubs just days before Christmas.

The workers, who voted to authorize strikes in recent days, joined picket lines on Thursday after Amazon ignored a Sunday deadline the union had set for contract negotiations. Workers at Starbucks stores are also were going on a five-day strike starting Friday to protest lack of progress in contract negotiations with the coffee company.

Amazon, for its part, said it doesn't expect the strike at delivery stations to impact holiday shipments.

The e-commerce giant has a couple hundred employees at each delivery station. The Teamsters mainly have focused on organizing delivery drivers, who work for contractors that handle package deliveries for the company. But Amazon has rebuffed demands to come to the negotiating table since it doesn't consider the drivers to be its employees.