FOUR children were seriously injured on Wednesday when an unexploded landmine they had mistaken for a toy blew up in Battambang province’s Phnom Proek district. “The children didn’t realise they were playing with a mine,” said Sareth Visith, deputy police chief of Phnom Proek district yesterday. Pring Panharith, Battambang’s demining unit manager, said 260 people have been injured due to unexploded ordnance in the province this year.