At least 11 schoolchildren and a teacher were wounded on Friday when suspected Maoist rebels set off an explosion at a school in west Nepal, the army said.
The incident took place in Dailekh district, 550 km west of the capital Kathmandu, while children were appearing for a school-leaving examination, an army officer said.
"The injured are undergoing treatment in a local hospital," he said, adding the nature of the injuries was not known.
Dailekh is a stronghold of the Maoists who want to overthrow the Hindu monarchy and set up a single-party communist republic.
More than 13,000 people have died in the conflict since 1996 and according to a local child rights' group, about 400 of them were children.
There was no comment from the rebels about the attack.