At least 21 people were killed in flash floods triggered by torrential rains on Sunday in Morocco's Atlantic coastal province of Safi, 330 kilometres (205 miles) south of Rabat, Moroccan authorities said.

The floods also injured 32 people, and most of them have left the hospital, authorities said in a statement.

One hour of heavy rain was enough to flood homes and shops in the old town of Safi, and sweep away cars and cut many roads in Safi and its surroundings, as rescue efforts continue, they said.

Damage to roads in the area cut off traffic on several roads of the town, which lies on Morocco's Atlantic coast.

As teams searched for other possible casualties, the weather service forecast more heavy rains for Tuesday across the country.

Morocco is experiencing heavy rain and snowfall on the Atlas mountains, following seven years of drought that emptied some of its main reservoirs.