Hillsborough, N.C. — Officials are investigating a bus pulled over for safety violations Wednesday afternoon at a weigh station near the merger of Interstate 40 and Interstate 85, the Highway Patrol said.

The bus, traveling from Wilson to Mexico, was stopped at mile marker 143 because a suspension problem was noticed with the bus.

Officials are checking the documentation of some people on the bus who did not produce passports. Interpreters were brought to the scene to help police communicate with the 15 to 20  Spanish-speaking passengers.

The bus was towed from the scene and passengers were placed on another bus.

The Highway Patrol had been made aware by the Federal Motor Carrier Safety Administration that illegal immigrants were being taken to certain destinations in the country. The bus originally was believed to be apart of that group.

Federal authorities are investigating whether the bus was connected to Iguala BusMex and Angel Tours Inc., which were ordered by the Federal Motor Carrier Safety Administration to cease commercial operations after an accident in Texas.