A school bus with no children on board caught on fire Tuesday in Clayton County, temporarily shutting down all southbound lanes of I-675, authorities said.

All lanes were reopened by around 4 p.m.

The incident happened near Ga. 42 just before 3 p.m. Clayton County Public Schools spokesman Ronald Shields confirmed to Channel 2 Action News it was one of their buses and only the driver was on board.

The driver escaped the burning bus safely after she noticed smoke, he said.

The Clayton County Fire Department told Channel 2 the bus is “demolished.”

“We commend the bus driver for swift action in notifying the authorities and thank the first responders for their prompt attention,” Shields said in a statement.

An investigation into the cause of the fire is ongoing.

In other news:

Fellow officers give eulogy in honor of fallen officer