Floods have killed at least 29 people in and around Istanbul after the worst rainfall in 80 years hit Turkey’s biggest city, turning roads to rivers, swamping residential streets and sweeping away cars in two days of downpours.

Television footage showed families huddled on the roofs of half-submerged buses, people climbing from the windows of floating cars, and rescuers helping those stranded to safety over ladders or crouched in the teeth of bulldozers.