Self-styled Lieutenant Vanlalfela (35) and Corporal Chusarai (32) were arrested yesterday with documents showing that they were abducting people for ransom and extortion.
"The outfit has been trying to regroup different Bru militants. They told the investigators that they were involved in the killing of Zarzokima near Mizoram-Tripura border's Bunghmun hamlet in November," he said.
He said the duo admitted that they committed the crime to derail the process of repatriation of Brus from the six relief camps in Tripura.
Home Minister also said the arrested Bru militants were hardcore insurgents who joined the erstwhile underground Bru National Liberation Front (BNLF) and then joined Bru Liberation Front of Mizoram (BLFM).