Srinagar: At least four civilians were injured in a grenade attack on Tuesday in the Pulwama district of Jammu and Kashmir, officials said.Militants lobbed a grenade towards a security forces vehicle at Pulwama chowk this afternoon, however, the grenade exploded on the roadside.The injured persons have been rushed to a hospital while security forces have cordoned off the area, the officials added.Kashmir has seen a spate of grenade attacks by militants in recent times.On Monday, security forces had detected and defused six grenades planted by militants on the busy Parimpira-Panthachowk axis of National Highway 44.Moreover, three people, including two women, were injured in a grenade attack at Chanpora in Srinagar last week.