Following a heavy hailstorm which lasted about half an hour, some of the city's steep streets became fast-flowing rivers.
Water rushed down the streets dragging along cars, buses and market stalls.
The worst affected area was around the city's largest farmers market, where drains were blocked by rubbish, making the flooding worse.
Residents said city officials should have done more to maintain the city's storm drains during the rainy season.
Locals were caught by surprise by the hailstorm which hit the city at 18:45 local time (22:45GMT).
