A couple and their teen daughter were hacked to death, allegedly by their 20-year-old son, in the Kaptanganj area of this Uttar Pradesh district, police said on Sunday.
The accused is on the run, Superintendent of Police Anurag Arya said.
The police said Rajan Singh, a resident of Dhandhari village in Kaptanganj, allegedly committed the triple murder after being reprimanded by his father a couple of days ago.
Rajan Singh allegedly killed his father Bhanu Pratap Singh, 45, mother Sunita Singh, 42, and 13-year-old sister Rakhi Singh with an axe after they had gone to sleep on Saturday night, Mr Arya said.
After receiving information about the triple murder, forensic and police teams with sniffer dogs reached the spot.
The bodies have been sent for post-mortem.
Mr Arya said police teams are on the lookout for prime suspect Rajan Singh.
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