A 17-year-old girl and her boyfriend allegedly stabbed her mother and strangulated her to death in Madhya Pradesh’s Gwalior city as she was against their friendship, police said on Monday.

The incident came to light on Sunday following which the girl was detained and her 25-year-old friend was arrested, they said.

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The man had earlier also been arrested after the girl ran away with him two months ago. He later got bail, the police said.

The 38-year-old victim, hailing from neighbouring Bhind district, lived with her daughter in Gadiapura, under Hazira police station limits.

On Sunday, police got information that the door of the victim’s house was not opening. Police then reached the spot, opened the door, and found the woman lying dead in a pool of blood, Superintendent of Police Amit Sanghi said.

The girl was not found in the house.

The police then searched for the minor and found her with her boyfriend on Sunday evening, Sanghi said.

He said the girl and her friend told the police that they stabbed the woman with a vegetable knife and strangulated her to death.

The duo also told the police that they had plans to run away, the official said.