SRINAGAR: Four security personnel, including a Sashastra Seema Bal (SSB) sub-inspector, two constables of the paramilitary force and a J&K cop were injured in a grenade attack in Nowhatta chowk of Srinagar ’s downtown area late Wednesday evening. Barely an hour before that, a 38-year-old man was critically injured after terrorists barged into his house in north Kashmir ’s Kupwara district and shot him.Around 9.10pm, terrorists lobbed a hand grenade targeting a joint team of SSB’s 55th Corps and J&K Police stationed at the checkpoint in Nowhatta chowk. In the explosion, three SSB personnel — SI Anurag Roa, head constable Sananta Kumar and constable Durgesh — and one J&K Police constable, Abdul Majeed, sustained splinter injuries, an SSB officer said.The four, all of whom suffered leg injuries, were taken to a police hospital for treatment, the officer added. Soon after the attack, a joint team of security forces launched a search operation in the area to trace the perpetrators.Earlier in the evening, terrorists brandishing automatic weapons barged into the house of Ali Mohammad Beigh (38) in Beigh Mohalla of Kralgund area, in Kupwara’s Handwara tehsil, around 8.20pm and fired at him, leaving him grievously wounded, said a cop.Beigh was rushed to a nearby primary healthcare centre in a critical condition, from where he was referred to Handwara district hospital. A joint team of police, Special Operation Group and Army launched a search in the area for the attackers shortly afterwards, the police officer added.