Poachers have killed yet another one-horned rhino in Assam's Kaziranga National Park and took away its horn, officials said Thursday.

The incident came to the light Thursday when forest guards patrolling the park recovered the carcass of a male rhino from the Burhapahar forest range of the park.

Officials said the poachers killed the rhino Wednesday night.

"The poachers chopped off the horn and fled," a park official said.

This was the 21st rhino killed by poachers in protected areas of Assam since January this year. Most of the poaching took place in Kaziranga, a Unesco World Heritage Site.

A total of 42 rhinos were poached in Assam last year - 27 in Kaziranga alone.