A Turkish news agency says one person has drowned after being swept away in flood waters in Istanbul. The 'Dogan' news agency says torrential rains that have hit much of Turkey caused the Kurbagadere river in Istanbul to swell on Tuesday. One municipality worker trying to rescue vehicles that were stuck in flood waters, died after being swept away. The heavy rains inundated basements and roads, causing traffic havoc in the city. Authorities have asked residents to avoid unnecessary travel.