Guwahati: The famed abode on one-horned Indian rhino and a UNESCO World Heritage Site, Kaziranga National Park in Assam has faced tough challenge to keep rampaging rhino poachers under check basically because of growing number of settlements suspected illegal migrants from Bangladesh around the Park’s core area.

The poachers have been virtually on rampage in the Park since the beginning of this year killing nine precious rhinos so far in the Park, according to official figures.