The grenade exploded at around 7:30 pm in front of the Paltan Bazaar police station near the station injuring seven people critically while seven others received minor injuries.

The critically injured included a minor girl, five CRPF personnel and an Assam police personnel.

The police claimed ULFA militants had targetted a CRPF patrol party in the area.

The injured were admitted to Guwahati Medical College Hospital.

Senior police and civil officials rushed to the spot and the entire area has been cordoned off.

Railway officials said here that trains would run as per schedule.

Paltan Bazaar is a busy commercial area from where long-distance buses operate and it was unusually crowded with the 'Magh Bihu', a major festival.