Meanwhile, forest guards found two .303 rifles from Bishwanath Bhola Chapori in Sonitpur district. The two rifles were found in the jungles near the northern bank of river Brahmaputra, a part of Kaziranga National Park's sixth addition, forest officials said. The arms recovered today was suspected to have been used by poachers who killed a rhino and removed its horn in the Park's western range, where two rifles and several rounds of ammunitions were already recovered. A massive search operation was on to nab the poachers who was suspected to have escaped to the northern side of the Park, sources added.