A 13-year-old Zainab, her elder sister, and parents had a biryani feast on Saturday night. A little after midnight, watermelon was served as what appears to be dessert. Severe symptoms followed early Sunday morning. Treatment started, but in vain. The four family members died one after one in a tragic incident that has left Mumbai in shock. The four deaths were due to suspected food poisoning, said police. NDTV's Apurva Adhikari brings you the report.