A suspicious vehicle in the parking lot of the federal government’s main nuclear weapons plant in Texas prompted an emergency alert, road closures and a call to the bomb squad but ended without incident Tuesday.

Employees at the Energy Department’s Pantex Plant north of Amarillo sheltered in place shortly before noon local time while the vehicle, which drew attention during a “routine inspection,” was searched, Steven Wyatt, a spokesman, said by email. He didn’t say what was suspicious about the vehicle.

“It was determined there were no prohibited items or explosives, and the emergency event was resolved without incident,” Wyatt said.

Read more about the Amarillo Police Department’s emergency response here.