Three students of C.S.I. Boys Higher Secondary School escaped with injuries when a portion of a wall collapsed on Thursday.
According to Chief Educational Officer A. Gnanagowri, the incident occurred when the boys were having lunch near the retaining wall when it suddenly collapsed.
School Headmaster D. Wilson Jayakumar said that a sewage canal adjoining the wall could have weakened the structure that resulted in the collapse.
The wall was constructed by the Coimbatore Corporation in 1970s when they took over the school land for laying the Good Shed Road, he claimed.
Last year, another portion of the wall had collapsed.
The injured students were Akash Britto and P. Hariharan, of standard VI, both suffered minor bruises, and Musthafa of standard VIII had his left leg injured.
He was initially taken to the Coimbatore Medical College Hospital.
Later, he was shifted to a private hospital. The school would bear the cost of treatment, the headmaster said.
Meanwhile, the Department of School Education had issued a circular asking all schools to ensure their students were not allowed near weak or dilapidated structures.
This will now be reiterated, she added.
Police personnel were deployed to regulate the traffic as a portion of the debris had spilled on to the Good Shed Road.
An earth mover from the Corporation removed the debris later in the day.