Kolkata, July 21 (IANS) Police have arrested a man for beheading a 13-year-old boy and offering his blood to an occult deity in a West Bengal village. The gruesome incident took place on Friday at Dararkandi village in the central district of Murshidabad, some 200 km from here, police said Sunday. According to district police official Gautam Banerjee, the culprit, identified as Pintu, had been arrested. "He has confessed to killing Rezaul Karim." Pintu said he practiced black magic and wanted to acquire mystical powers. He had been advised by a sorcerer to sacrifice a young boy for the purpose....