GAUHATI, India (AP) — Angry villagers burned army vehicles in protest after more than a dozen people were killed by soldiers who mistakenly believed some of them were militants in India’s remote northeast region along the border with Myanmar, officials said Sunday.

Nagaland state’s top elected official Neiphiu Rio ordered a probe into the killings, which occurred on Saturday. He tweeted, “The unfortunate incident leading to the killing of civilians at Oting is highly condemnable.”

An army officer said the soldiers fired at a truck after receiving intelligence about a movement of insurgents in the area and killed six people. As irate villagers burned two army vehicles, the soldiers fired at them, killing nine more people, the officer said on condition of anonymity as he was not authorized to talk to reporters.

One soldier was also killed in the clash with protesters, he said.

On Sunday, fresh violence erupted when nearly 200 residents attacked the army camp in Mon district, going on a rampage and setting fire to residential quarters. Army soldiers fired live ammunition at the crowd, killing two more people, police and a local student leader, Yuwong Konyaki, said.

Police rushed reinforcements in the area to stop further violence.

An Indian army statement said it “deeply regretted” the incident and its aftermath, adding that “the cause of the unfortunate loss of lives is being investigated at the highest level and appropriate action will be taken as per the course of law.”

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“Security forces have suffered severe injuries in the incident, including one soldier who succumbed to the injuries,” it added.

The statement said “credible intelligence” on insurgent movements indicated that a “specific operation was planned” in Mon district in Nagaland.

Insurgents often cross into Myanmar after attacking Indian government forces in the remote area.

Nyamtow Konyak, a local community leader, said those killed were coal miners.

India’s Home Minister Amit Shah expressed anguish over the “unfortunate incident” and said the state government will investigate the killings.

The army officer said the soldiers had laid an ambush for a week following intelligence that insurgents were planning to attack soldiers in the area, 400 kilometers (250 miles) east of Gauhati, the capital of Assam state.

Government forces are battling dozens of ethnic insurgent groups in India’s remote northeast whose demands range from independent homelands to maximum autonomy within India.