A view of the damage on the banks of the Losentse river on Monday, Aug.12, 2019 in Chamoson, canton Valais, Switzerland. The search continues Monday morning in Chamoson, after the violent storm that struck on Sunday evening. Two people are still missing, carried away in their cars by a mudslide. (Jean-Christophe Bott/Keystone via AP)

GENEVA (AP) — Authorities in Switzerland are searching for a man and a girl missing since Sunday after their car was swept away by a flash flood caused by heavy rain in the Swiss Alps.

Police in the southern canton (state) of Valais said Monday they have little hope of finding the 37-year-old man and the 6-year-old girl alive. More than 70 rescuers including a helicopter crew searched for them through the night.

Videos posted online showed a wave of water, mud and debris crashing down the Losentze River near the village of Chamoson.

Authorities say a second car that was also swept away has been found, but nobody was inside that vehicle.

The rest of a car washed away by the torrential lava is visible in the bed of the Losentse river on Monday, Aug. 12, 2019 in Chamoson, canton Valais, Switzerland. The search continues Monday morning in Chamoson, after the violent storm that struck on Sunday evening. Two people are still missing, carried away in their cars by a mudslide. (Jean-Christophe Bott/Keystone via AP)
People return to the shelter of their cars during heavy rain at Reculver Towers, in Reculver, England, Monday Aug. 12, 2019. (Gareth Fuller/PA via AP)
Women walk by the pier as rain clouds gather over the sea, in Southsea, Hampshire, England, Monday, Aug. 12, 2019. (Steve Parsons/PA via AP)
Miky the dog, wearing a hat for sun protection, waits to be sprinkled with water by its owner while on a walk in a park as temperatures reached 34 degrees Celsius (93.2 Fahrenheit) in Bucharest, Romania, Sunday, Aug. 11, 2019. The national weather authority issued a heat wave warning with temperatures expected to rise above 35 degrees Centigrade (95 Fahrenheit) in the shade in the coming days.(AP Photo/Vadim Ghirda)
A man holds a sunshade on the sandbank on Danube river in Belgrade, Serbia, Monday, Aug. 12, 2019. Hot weather has set in with temperatures rising up to 37 Celsius (98,6 Fahrenheit) in Serbia. (AP Photo/Darko Vojinovic)
A woman sunbathes on the sandbank on Danube river in Belgrade, Serbia, Monday, Aug. 12, 2019. Hot weather has set in with temperatures rising up to 37 Celsius (98,6 Fahrenheit) in Serbia. (AP Photo/Darko Vojinovic)