ABERDEEN, S.D. (AP) -- Two more businesses have been allowed to join a lawsuit against Northern Beef Packers by businesses that have filed liens against the Aberdeen processing plant for unpaid work.

Iowa-based Structural Engineers and Jensen Rock and Sand of Aberdeen were added to the case Tuesday.

Scott Olson Digging of Huron earlier filed a $2.1 million lien against the developing plant, prompting Northern Beef Packers to sue the contractor, claiming it was being overcharged. In turn, Scott Olson Digging sued the beef plant for money the company claims it is owed.

In all, more than 15 mechanic's liens totaling more than $13 million have been filed against the beef plant.

Three other businesses previously were allowed to join the lawsuit, and the judge in the case says there likely will be more.

An Oct. 2 deadline has been set for businesses to file liens against the plant.

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