There have been violent protests in the Indian state of Bihar after 22 children died and dozens more fell sick after eating a tainted free school meal.
Four police vehicles were set on fire in Dharmasati Gandaman in Saran district during the protests by parents and hundreds of villagers.
A doctor at the local hospital said a chemical used in pesticides was likely to be the cause of the contamination.
The Mid-Day Meal Scheme provides free food, but often suffers poor hygiene.
It was introduced to combat hunger and boost school attendance, and reaches 120 million children in 1.2 million schools across the country, according to the government.
But 28 sick primary school children were taken to hospitals in the nearby town of Chhapra and the state capital, Patna, after consuming a meal of rice, soybeans and potatoes on Tuesday.
BBC correspondent Amarnath Tewary said local people armed with poles and sticks had blocked streets and locked railway gates, halting the movement of trains.
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