Four members of the Kuki tribes, including two women, were killed when suspected militants attacked their villages in Manipur's Tamenglong and Noney districts on Sunday.
The Kuki Inpi Jiri, Tamenglong and Noney, has announced a 24-hour economic blockade in protest against the killings.
A day after the incident on Monday, Manipur Home Minister Govindas Konthoujam said: "No act of violence will be allowed to derail the state's path towards peace and normalcy".
Kuki organisations have alleged that Naga insurgents from NSCN(IM) and ZUF(K) were responsible for the attacks.
A woman was also reported missing in connection with the incident.
The first attack took place at Tamenglong, leaving two people dead, while the second one took place around 12 hours later, claiming two more lives.
The incident coincided with 'Sahnit Ni' of 'Black Day', which is observed annually on September 13 by the Kuki community in Manipur to remember the victims of ethnic violence during the Kuki-Naga conflict in the state in the 1990s.
Those killed were identified as Seineh Singsit and his wife Lhingzangai; their six-year-old son was injured and is currently hospitalised.
Chief Minister Y. Khemchand Singh expressed deep anguish over the killings, saying that violence against innocent civilians is a cowardly act and unacceptable.
"Such cowardly acts of violence against innocent civilians are unacceptable and have no place in our society," the CM said.
The Kaimai Village Authority condemned the attack, stating that it was a "deliberate and malicious attempt to create disharmony and division among communities".
The authorities claimed that the armed assailants opened fire on a family at around 4 am. It was alleged that the incident was part of an attempt to terrorise and displace Kuki-Zo villagers from their ancestral areas.
The village authority urged the administration to conduct an impartial investigation into the incident. They also demanded immediate deployment of Central security forces in Tollen and neighbouring Kuki villages.
In a post on X, Konthoujam said he was "deeply anguished" by the tragic incident at Tollen Kuki Village, which claimed the life of Lhingjangai Singsit and left her husband and young son with gunshot injuries. "Violence against innocent civilians is unacceptable and will be dealt with firmly," he said.
