Tekirdag governor Mehmet Ceyhan said the area where the derailment happened was muddy and hard to reach.
Ten people were killed and 73 wounded when a train came off the rails in northwest Turkey on Sunday after heavy rain and a landslide, Turkish television channels quoted a health ministry official as saying.
"A suburban train had an accident. due to a landfall".
The Turkish army said in a statement that it sent helicopters to the scene, while the Istanbul municipality on Twitter said 24 rescue workers and six rescue vehicles were on their way to provide assistance. "Many of those injured have been taken off the site", governor Mehmet Ceylan said.
Reports said the surrounding area was muddy due to recent rains.
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At least 10 people were killed and more than 70 injured Sunday when a passenger train derailed in northwestern Turkey, Turkish authorities said.
In a statement, Erdogan said the train accident is being investigated thoroughly and conveyed his condolences to the families of those who lost their lives in the accident.
The train derailed in a village in Tekirdag province.
Over the past few years, Turkish cities have been building high-speed rail lines to replace the country's ageing network.
Turkey's rail network has been hit by several fatal accidents in recent years.
Turkey's worst accident on the railway was in the province of Sakarya in July 2004, when 41 people were killed and 18 injured in a derailment.