Four men have been arrested in the north Indian state of Uttar Pradesh after a police officer was killed by a mob protesting the alleged slaughter of 25 cows.
Police are now on the look-out for 25 other suspects.
Cows are considered sacred by many Hindus and some accused of slaughtering the beasts have been lynched by vigilante mobs in the past.
Our India correspondent Neha Poonia reports.
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