Still in the midst of its “Quick Strike” operation started last month, the Federal Motor Carrier Safety Administration has ordered Mexican-based bus company Autobuses Zacatecanos to cease all operations in the U.S. after agency investigators found the company was not inspecting or maintaing its vehicles and that its drivers were not complying with hours of service rules nor logging hours.

The bus carrier marks the agency’s 20th shutdown of the year so far. Seven of those have been trucking companies, and 13 have been bus companies. Moreover, three additional commercial driver’s license holders have been shutdown.

The Quick Strike program has put 50 specially trained investigators in the field to target high-risk carriers. “Bus and truck companies that fail to adhere to our safety regulations will not be allowed on our highways and roads,” said Department of Transportation Secretary Ray LaHood. “We demand that safety come first.”

Click here to see a copy of the imminent hazard out-of-service order.