PURNEA, Feb. 11 -- A four-year-old boy and his three-year-old sister went missing from the Government Medical College and Hospital (GMCH), Purnea, on Monday evening, officials said. The children's mother alleged that the siblings were abducted by two women. Police have launched a search operation to trace and recover the children. According to a complaint, two women posing as relatives entered the ward and took the children-Shivam Kumar (4) and Lakshmi Kumari (3)-promising to buy them food. When they failed to return even after an hour, the woman's eight-year-old daughter informed hospital staff, following which police were alerted....