A new round of artillery has been fired in the ongoing antitrust and licensing fight between Apple and Qualcomm.

And this time, Qualcomm is on the receiving end of the shot.

Four contractors that build iPhones and other Apple products say Qualcomm violated two sections of the U.S. Sherman Antitrust Act.

The contractors — Foxconn parent Hon Hai Precision Industry, Wistron, Compal Electronics and Pegatron — made their claims in a filing late Tuesday in the U.S. District Court for the Southern District of California.

The contractors say Qualcomm violated the Sherman Act when it sued them in May in order to make the companies pay license fees to Qualcomm.

Apple directed the contractors to withhold their payments while a suit between Apple and Qualcomm played out.

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