A plane carrying former President George W. Bush out of Philadelphia was forced to make an emergency landing overnight after the pilot reported smelling smoke, according to CNN.

Bush was traveling to Dallas from Philadelphia, where he was in town following an appearance at the First Tee Greater Philadelphia fundraiser Saturday night.

During the flight out of Philadelphia International Airport, the pilot of the Gulfstream IV airplane reported the smell of smoke in the cockpit, according to Federal Aviation Administration spokeswoman Holly Baker.

Bush's plane landed safely in Louisville, Kentucky, and later made its way back home to Dallas early Sunday morning.

There is no immediate explanation on what caused the crew to smell smoke.