Schools are using CCTV cameras designed to keep pupils safe to spy on teachers, it has been claimed.
Teachers are being subjected to "permanent surveillance", with school leaders monitoring the footage and using it to make judgments about the performance of their staff, according to the NASUWT teaching union.
In many cases, teachers say they cannot turn off the cameras in their classroom, which are constantly recording lessons, a poll conducted by the union found.
The survey comes as delegates attending the NASUWT's annual conference in Birmingham debate a resolution warning that monitoring of teachers is becoming excessive.
More top news
The Islamic centre where the Manchester suicide bomber is thought to have prayed says the attack "has no place in Islam or any religion".
German chancellor Angela Merkel and Indian prime minister Narendra Modi among those to praise "great spirit" of Manchester people.
The bomber's identity has been confirmed by Greater Manchester Police.