Seven people were injured on Wednesday morning after they stepped on an old landmine while walking to their rice fields in a former battlefield in Anlong Veng district of Oddar Meanchey province, the provincial governor, Sar Thavy said.

"Two persons were seriously injured and the other five slightly wounded," he said, adding that the injured were sent to the provincial hospital soon after the accident that occurred about 3 km from a village.

He said the type of exploded landmine has not been identified yet.

Cambodia is one of the world's worst countries suffered from landmines. An estimated 4 million to 6 million landmines and other munitions left over from three decades of war and internal conflicts that ended in 1998.

From 1979 to Sept. 2013, landmines had killed about 19,683 people and injured 44,606 others, a government's report said.

Heng Ratana, director general of the Cambodia Mine Action Center, has said that about 3.1 million landmines and unexploded ordnance have been removed and destroyed so far, and the country is seeking about 50 million US dollars a year until 2020 to entirely get rid of all types of anti-personnel mines.