The attack comes days ahead of a summit of the Shanghai Cooperation Organization, a grouping founded by China and Russia to counter Western alliances.

The BBC spoke to a survivor of the attack, which reportedly involved heavy weapons including rockets and grenades.

Gunmen killed 21 miners and wounded six others in Pakistan’s southwest, a police official said Friday, drawing condemnation from authorities as a search was launched for the assailants. The latest attack in the restive Balochistan province came days ahead of a major security summit being hosted in the capital.