Two teenagers, aged 16 and 14, were found hanging from a tree in a remote village in Assam's Kokrajhar district, police said.
The victims were related to each other, police said, and added that their families have alleged that the teens were raped and killed. Police are awaiting the autopsy report to ascertain whether it was a suicide or rape and murder, like the family has alleged.
A case has been registered and five people have been detained in the case.
"We are looking at all possible angles, but the post-mortem report will give us something conclusive. We are waiting for it. Meanwhile our investigation would continue," SS Panesar, Additional Superintendent of Police, Kokrajhar said.
The teens, who were aunt and niece, were found hanging in a forest in their village where they lived.
Assam Chief Minister Himanta Biswa Sarma said: "I have instructed the Assam Police to do an expeditious investigation to unearth the cause of the deaths. The government will take stringent action, if there is any foul play. If the victims were forced to do self harm, the police will find out the reason."