A group of Minnesota employees that were recently fired from Chipotle Mexican Grill, Inc., after an audit are suing the restaurant chain over pay, the Star Tribune reported Thursday.

According to the Star Tribune, about 75 of the workers-who were fired last month after an audit revealed that they were illegal workers-filed a class-action lawsuit on Thursday alleging that Chipotle did not comply with a Minnesota law requiring all back pay to be distributed within 24 hours of discharge.

Denver-based Chipotle did not disclose the precise number of people who were fired last month. The Star Tribune reported that the former workers claimed it was 700, but another source said the number was closer to 350.

At the time of the firings, a Chipotle representative told the Star Tribune that workers were given opportunities to provide documents that could prove they were legally able to work in the United States and if they couldn't, they were fired in accordance with U.S. law.

However, the workers claim that they were fired without much explanation and were not given time to provide documents proving they were legal workers, the Star Tribune said.

In an e-mailed statement, Chipotle said that the claims made in the suit are without merit and that the company will defend itself vigorously.

“We have paid every employee everything that they were owed including wages, accrued vacation, and bonuses,” the company wrote. “We provided contact information to employees so anyone who did not feel they were paid everything they were owed could contact us, and we have heard from only a few employees.”

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