-At least four labourers died and two others affected due to poisonous gas during digging well here on Saturday. Police said that six labourers were busy in digging well in Kattgar area of Hangu when following the leakage toxic gas filled in the well. Four labourers died of inhaling poisonous gas while two were affected who were shifted to hospital where their condition was also stated to be serious and death toll was feared to rise further.