The midday blast in Cizre, in the province of Sirnak, was attributed to members of the insurgent Kurdistan Workers Party, Today's Zaman reported.
The homemade noise bomb was placed in a hallway on the third floor of the school, the Hurriyet Daily News said.
The injured students were taken to a local hospital. Their conditions were not immediately released.
Theater accidentally screens 'Nymphomaniac' trailer instead of Disney's 'Frozen'
18-year-old elf alleges mall Santa pinched her buttocks on the job