ANKARA (AFP) - Turkey has declared three days of national mourning after more than 200 people were killed in an explosion at a coal mine, one of Turkey's worst industrial disasters, the prime minister's office said on Wednesday.

"Three days of national mourning have been declared as of May 13 due to the mine disaster in Soma" in western Turkey, according to a statement from the prime minister's office.

Flags will be flown at half mast, it added.