Indian forces mistakenly killed at least 14 civilians in the northeastern state of Nagaland, local officials said.

Indian Interior Minister Amit Shah said he was upset by the news of civilians being killed in the shooting late last night.

"The state government will thoroughly investigate this incident to ensure justice for the bereaved families," Shah wrote on Twitter.

Anguished over an unfortunate incident in Nagaland's Oting, Mon. I express my deepest condolences to the families of those who have lost their lives. A high-level SIT constituted by the State govt will thoroughly probe this incident to ensure justice to the bereaved families.

- Amit Shah (@AmitShah) December 5, 2021

Local media reported that Indian security forces mistakenly opened fire on civilians, and the exact number of casualties is unknown. It is not clear what led to the incident in that federal state bordering Myanmar, writes Reuters.