A bus carrying pilgrims from Kannauj was on its way to a temple in Rajasthan when the other bus, which was coming to Agra from Jaipur, hit it, they said.
Malpura police station SO Ramesh Bhardwaj said three persons died on the spot and the bodies have been sent for postmortem.
The driver of the bus that was carrying the pilgrims was among those killed.
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