BERKELEY (CBS SF) — More than 11,000 clerical and administrative support workers are on a one-day strike against the 10-campus University of California system and medical centers.

The strike Tuesday by members of Teamsters Local 2010 comes amid negotiations over a new contract.

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The union claims violations of state law by the university and unfair labor practices including failure to bargain in good faith, among other allegations.

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A UC statement asserts that the strike is counterproductive to negotiations in which it is offering market-competitive wage increases and good benefits.

The labor action coincides with a strike by more than 600 plumbers, electricians and other trades workers at the University of California, Los Angeles. That five-day strike began Friday.

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