Starbucks' union says workers are walking off the job at some 300 — out of over 10,000 — stores across the U.S. as contract negotiations falter. The company urges it to return to the bargaining table.

The ongoing Starbucks union workers' strike has now expanded to a dozen states, union representatives confirmed to USA TODAY on Monday.

The walkouts launched by Starbucks (SBUX) workers pushing for better working conditions and wages are ramping up to reach dozens of stores and several major metro areas.