(CNN) -- A bus overturned Thursday morning on the President George Bush Turnpike Irving, Texas, trapping passengers inside the vehicle, the emergency management office in the Dallas suburb said.
Information on whether anyone was injured wasn't immediately available.
Video from CNN affiliate KTVT showed a bus on its side, surrounded by numerous emergency personnel. Traffic on part of the turnpike -- a toll road in the Dallas area -- was halted.
The bus was headed to casinos in Oklahoma when the crash happened, according to Nick Robison with the emergency management office in Irving, Texas. The bus is owned by a Dallas-area charter company, Robison said.
At least two people were killed a state police official said during a press conference.
The crash will take hours to clean up.