YANGON, Sept. 7 (Xinhua) -- Three miners were killed and five others went missing in a coal mine blast in Saw township in Myanmar's Magway region, the official Global New Light of Myanmar reported Friday.

The incident took place at Tun Yarzar coal mine, operated by a private company, shortly after 13 miners entered into the mine and reached a depth of 90 meters on Thursday morning.

The cause of the explosion was unclear so far.

Rescue work is underway for the five miners still trapped in the mine, according to local information office.