Nine workers died and three others were injured on Wednesday in a coal mine explosion in Khyber Pakhtunkhwa province in northwest Pakistan, police told EFE.

The explosion occurred early morning and was caused by gases inside the mine, leading to its collapse, according to officer Gulraiz Khan of Kohat district, where the accident occurred.

Rescue operations concluded with the extractions of only three survivors.

Pakistan has significant reserves of coal and numerous mines, but poor safety standards make them prone to frequent accidents.

In May, two explosions took place due to methane gas build-ups in two mines in Balochistan province (southwest) which killed 23 miners and injured nine.

Global union federation for miners, IndustriAll, has warned about apathy and negligence in the mining sector in Pakistan and urged the government to act promptly to improve miners' safety.