The Equal Employment Opportunity Commission has sued the US’s largest private employer, Walmart, over claims the retailer fired workers with disabilities who could not pass a computer-based assessment test.

In the class action lawsuit filed in Arkansas on Monday, the EEOC asserts that, in January 2017, newly hired staff at Walmart were given 180 hours to complete its “Pathways Graduation Assessment” test. Those who did not reach the 70% pass rate after three attempts were fired.