The explosion occurred at around 12:40 p.m. local time on Tuesday in Dawei town of Tanintharyi Region, the report said.
While cleaning the campus, the students found a bomb left over from the previous terrorist attack and brought it to the teacher. But the bomb dropped and exploded, killing one student and injuring 22 others and a student's parent, Xinhua reported.
The injured were sent to the local hospitals for medical treatment.
The security forces were carrying out mine clearance on the school campus, the information team said.
SD/PR
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