A teacher prepares to serve cooked rice to school children as part of free mid-day meal, distributed by a government-run primary school, at Brahimpur village in Chapra district of the eastern Indian state of Bihar July 19, 2013. Police suspect that India's worst outbreak of mass food poisoning in years was caused by cooking oil that had been kept in a container previously used to store pesticide, the magistrate overseeing the investigation said on Friday.[Photo/Agencies]