According to forest department sources, four poachers from Nagaland entered the Diplung forest range inside the sanctuary at 3 am this morning.
The alert guards sighted the poachers and there was exchange of fire following which one of them managed to escape and three were nabbed.
Pabitora with 68 sq km area has the highest density of rhino population in the country and houses 86 highly endangered one-horned rhinos.