PATNA, Feb. 19 -- Four persons have been arrested on charges of burning alive a 32-year-old woman and her 2-month-old newborn baby to death, branding her as 'witch' in Kalaiya (Kudasai) village under the Kumardungi police station (PS) in the West Singhbhum district of Jharkhand even as the husband of the deceased woman was battling for life in a hospital with severe burns injuries, police said on Wednesday. "We received the information of the incident on Wednesday morning. Four persons have been arrested in this connection. Evidences are being collected and further investigation is ongoing to identify other culprits involved," Amit Renu, West Singhbhum SP, told HT. The incident occurred late Tuesday night when 40-year-old Kolhan Sinku, his 32-year-old second wife Jyoti Sinku, their 2-year-old son and 2-month-old baby were sleeping in a room of their house....