Fire Services personnel cleared the school premises of the worms.
When the students of the Government Girls Higher Secondary School arrived today after a four-day holiday, they noticed blanket worms in and around the building walls and in the classrooms.
The insects had sneaked in from nearby trees.
They reported it to the teachers and the school personnel and teachers too noticed it.
"The school headmaster requested us to take action and a team of five personnel was deployed besides a mini-water tanker," Tamil Nadu Fire and Rescue Services Station Officer S Muniyandi told PTI.
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"The children were scared and the school had to declare a holiday," he added.
The school had opened today after the weekend and holidays for Krishna Jayanthi and Independence Day.
In India, the Lymantria dispar Linnaeus which is known as the 'kambli poochi' or blanket worm is a common insect found crawling up walls of buildings, especially during the monsoon season.