The union representing AC Transit workers rejected a labor contract deal with the Bay Area bus system over the weekend, just weeks after the union threatened to strike, according to a report by the Contra Costa Times.

The contract agreement between the union, Amalgamated Transit Union Local 192, and AC Transit was tentatively been put forward on Aug. 6 but was overwhelmingly voted down by union members in a vote of 576 to 257, with nearly 70 percent voting against the deal.

The rejected contract would have instituted a 9.5 percent pay increase for workers over the course of three years but would have also have required them to begin contributing a share of their medical insurance premiums, the Contra Costa Times reports.

The union represents 1,760 workers, including bus drivers, mechanics, dispatchers and clerical workers.