LEWISVILLE (CBSDFW.COM) – The driver of a tour bus was found dead by authorities after pulling over on the side of a highway in Lewisville.

Police responded to the call just before 2 p.m. in the southbound lanes of the Sam Rayburn Tollway near Denton Tap Road.

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A Lewisville police spokesperson said the driver of the bus pulled over onto the left shoulder. When he was checked on by officers and paramedics, he was found dead.

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There are no immediate signs of foul play. The identity of the driver has not been released.

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The exact cause of the driver’s death is under investigation.