In Assam, one CRPF personnel dead and another six persons were injured in a grenade blast at crowded Paltan Bazar area in Guwhati around 7.45 pm on Saturday.State Law and Order IGP said that unidentified miscreants hurled a grenade targeting CRPF patrolling personnel. The injured were rushed to the Gauhati Medical College and Hospital.A massive search operation is on to nab the culprits.Meanwhile, indefinite curfew clamped at Dhubri town in Dhubri district after three people got injured when unidentified miscreants attacked them .Official sources said that indefinite curfew imposed after miscreants stabbed three persons. They were admitted in the Dhubri civil hospital.