Police said he had confessed to battering and stabbing to death his mother Anjali Agarwal, 42, and sister Kanika, 12.
The 16-year-old boy, who was the prime suspect in Greater Noida's Gaur City double murder case has been apprehended by the police in Uttar Pradesh's Varanasi.
On the night of December 4, the boy first hit his mother with a cricket bat while she was asleep and later used scissors and a pizza cutter to kill her. Noida police sources informed India Today that the minor had called his father on Friday morning from an unknown numbe. after which the father immediately informed the police.
The boy was traced and picked up from Varanasi on Friday night after he made a phone call to his father. He said his mother scolded him on December 4 afternoon, for studying on the sofa.
The 42-year-old mother and her daughter, 11, were found murdered in their apartment in Gaur City in Greater Noida on Tuesday.
He then killed his sister, who woke up after hearing the noise, apparently to hide his crime, the police said.
Asked about the motive of the crime, he said a probe is on and further details would be revealed in due course.
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According to the post-mortem report, Anjali had seven injury marks on her head, while Kanika had five.
The accused subsequently left his house after changing his clothes, which had bloodstains.
"He took a taxi from the gate of the housing society to New Delhi Railway Station, and from there he took a train to Chandigarh". He also left the murder weapons behind. By then, the Varanasi police had spotted him near the Dashashvamedh Ghat and informed the Noida police.
According to the statement, the boy took a train for Chandigarh, from where he went to Shimla.
The boy was reportedly weak in studies and used to get scolded over his poor performance.
An investigation revealed that the boy used to play a crime-gangster game on mobile phones.