West Bengal Chief Minister Mamata Banerjee has demanded a thorough investigation into the killing of civilians by security forces at Mon district in Nagaland.

At least 13 coal mine workers were gunned down by Assam Rifles jawan in Nagaland’s Mon district on Saturday evening.

“Worrisome news from #Nagaland. Heartfelt condolences to the bereaved families. I pray for the speedy recovery of those who were injured. We must ensure a thorough probe into the incident and ensure that all victims get justice!”  Banerjee said in a tweet.

Assam Rifles personnel, while conducting an operation after receiving inputs about the movement of militants belonging to the Yung Aung faction of proscribed outfit NSCN (K), opened fire on the pick-up truck in which the labourers were travelling, police said.

Assam Rifles expressed regret over the incident and ordered an inquiry, while also stating that one soldier was killed and several others were seriously injured.

Nagaland Chief Minister Neiphiu Rio promised a high-level probe into the incident and appealed to all sections of the society to maintain peace.