Unidentified militants lobbed the grenade on a security patrol at Tral bus stand, 35 kms from here, killing Ghulam Hasan Mir (60) and injuring six others, the police said.
They said the injured were immediately rushed to a hospital.
The whole area was cordoned off immediately after the blast and a hunt has been launched to nab the militants involved in the incident, the police said.
No militant outfit has so far claimed responsibility for the attack.