At least 21 people were feared dead on Wednesday after two days of torrential rains triggered flash floods in northwestern Turkey, sweeping cars into the sea and sending gushing water into homes and businesses. Sixteen people were believed to have been killed in Istanbul province and five in neighboring Tekirdag province, according to provincial officials. Three of the five killed in Tekirdag were from the same family. Among the dead in Istanbul were seven women textile workers who were trapped in their minivan. Several roads in Istanbul city were closed, including the airport road, blocked by big trucks dragged by water. Rescue missions were in full swing and residents in Istanbul had been warned not to wander outside local media said.