A case of treason has been filed against three teachers of a madrasa here after a video purportedly showed them stopping children from singing the national anthem during the Independence Day function, police said on Thursday.

The video of Maulana Zubaid Ansari of madrasa Arbia Ahle Sunnat stopping the children from singing the national anthem during the I-Day function after unfurling of the national flag went viral in the district on Wednesday.

District Magistrate Amarnath Upadhyay ordered an inquiry by district minorities officer Prabhat Kumar and a case was lodged against the three teachers under various sections of the IPC, including treason.

One of the teachers had been arrested and a hunt was on to nab the remaining two, police said.