Six persons were injured in a powerful hand grenade explosion at Sopore, 54 km north of Srinagar [Images] in Baramulla district.

Police said the militants tossed a hand grenade at security personnel at the main bus stand in Sopore, which exploded after missing the target, injuring civilian bystanders.

The injured were taken to a hospital in Sopore, where attending doctors referred four critically injured to Srinagar for specialised treatment.

No group has claimed responsibility for the attack.