A youth was arrested on Thursday after he stabbed and killed his grandmother, severed her head and threw it in the nearby jungle in a fit of rage, the police said.
The incident happened this evening in Noaga village within the jurisdiction of Sankrail police station in West Midnapore district.
Police officers probing the incident said Radha KantaBera, the grandson of Chenti Bera (60) suspected the elderly woman was practising witchcraft and there was altercation overthe issue between the two on Thursday.
In a fit of rage, Radha Kanta stabbed and killed his grandmother with a sharp weapon and later on severed her head from the body, the police said adding, when villagers tried to chase him, he ran inside the jungle close to the village and threw the severed head there.
District Superintendent of Police Bharati Ghosh said Radha Kanta was mentally deranged and has been arrested. The police are searching for the severed head in the jungle, she said.