A suspension bridge collapsed into a river in southwestern France on Monday morning, plunging the vehicles traveling across it into the water below and killing a 15-year-old girl. Several others were seriously injured, and officials believe there could be at least one person still unaccounted for .

The vehicles tumbled into the Tarn river at Mirepoix-sur-Tarn, a small town about 18 miles from Toulouse.

Four people including the teenager’s mother were rescued from the river, according to a statement from Dominique Alzeari, the public prosecutor for Toulouse, published in French news outlets. But the 15-year-old girl — who has not been named by the authorities — could not be saved.