Killing of four poachers inside Kaziranga National Park in north-east India last month was hailed as a major action against poaching of endangered one-horned rhinos. But the incident may have led to deaths of several rhinos to poachers bullets in Nepal's Chitwan National Park. "When there is pressure on poachers in Kaziranga, they turn to Chitwan and vice-versa," Nepal Minister for Forests and Soil Conservation, Deepak Bohara, told Hindustan Times on Monday.

Nepal's government was investigating the poaching of rhinos in the Himalayan nation after 28 of the endangered animals were killed over the past 11 months, an official said Monday, the Associated Press (AP) has reported.

Prime Minister Madhav Kumar Nepal and Forest Minister Deepak Bohara summoned conservation officials and the chiefs of police and army Sunday ordering them to come up with a strategy to halt the killings.

The Rhinos are protected by the government and the forests are declared conservation areas. Security forces are tasked with guarding them, however, increased political turmoil in Nepal has meant their redeployment to urban areas.

"Stopping the poaching is a major challenge for us. There is always an increase in poaching of wildlife in the conservation area when there is political problems," said Department of Forest and Wildlife Conservation official Megh Bahadur Pandey.

Indian rhinos are native to northern India and southern Nepal. Only about 200 remained before tough preservation laws began to be stringently enforced in the 20th century. Now there are an estimated 2,500 in the wild, though rhino poaching remains a serious problem.

The last count done in 2008 put the rhino population in Nepal at 435.

The Indian rhino is the second-largest of five living species, about three times the size of a Sumatran at up to 6,000 pounds (2,700 kilograms), standing 6 feet (1.8 meters) tall and 12 feet (3.7 meters) long.