Orakzai agency  - Two labourers were killed and two others sustained injuries when an explosion took place in a coalmine in central Kurram Agency on Tuesday. Dozens of labourers were busy in routine work inside a coalmine owned by Sher Khan a resident of Danda locality in central Kurram Agency, when suddenly, a blast took place at the mine at 11 am, locals said.There are two different views regarding the explosion that it either happened owing to the explosives present at the coalmine, or it occurred after the gas filled inside the mine, which caused a blast.A total of four labourers Usman, Zardad, Mir Zaman and Inamullah sustained severe injuries in the explosion, who were rushed to a nearby hospital, however, Mir Zaman and Inamullah died on the way to hospital. While the critically injured Usman and Zardad were referred to Peshawar. All the four labourers belonged to Shangla district of Khyber Pakhtunkhwa.