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A homeless man was found dead at an underpass in the Unkapani district apparently drowned by the flood, an AFP photographer on the ground reported. Police sealed off the area.

Flash floods briefly halted the ferry services connecting Asian and European sides of the city, while authorities warned citizens to be careful in the adverse weather conditions.

Floods which lasted around two hours also affected the historic Grand Bazaar - one of the world's oldest covered markets - with shop owners rushing to evacuate the water.

The private NTV television reported many cars stranded in traffic and rescued by fire engine teams.

In one district, a parked car fell into a pit the heavy rain had caused on the road.

On Saturday, Turkey marked the anniversary of the 7.4-magnitude quake that hit Izmit - around 100 kilometres east of Istanbul - on August 17, 1999, killing at least 17,400 people, including 1,000 within the economic capital of the country.

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