An underground water pipe burst in Florence, Italy, creating a 200-yard-long sinkhole that buried dozens of cars in the early hours of Wednesday.

The sidewalk collapsed on the Lungarno Torrigiani, a road alongside the Arno River that is not far from the famous Ponte Vecchio, part of the city’s historic center, a Unesco World Heritage site.

Dario Nardella, the mayor of Florence, wrote on Twitter that no injuries had been reported and that firefighters had been sent to the scene.

According to The Associated Press, Mr. Nardella said the sinkhole had been caused by a large gash in the pipe, which is two feet in diameter and is one of the main sources of water for the surrounding neighborhood. There was no leak in the banks of the Arno, the mayor said.