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The grenade was hurled at the security forces deployed on law and order duty at Murran chowk in the district, 31 km from here, a police official said.
He said the blast resulted in the death of a civilian identified as Mohammad Ayoub Wani and injuries to a CRPF jawan Constable Daljit Kiran.
Security forces have been put on alert and a manhunt has been launched for the militants, he added.