Teachers who are abused online by their own pupils "feel very personally hurt" by the vitriol directed at them on the internet, a headmaster of an east London school told Daybreak.
Ges Smith, the headmaster of a school in Walthamstow, said there were "two elements" to the effects of online abuse.
"One, it can be professionally and credibly damaging. And two, I have seen people who have been abused by young people online and they actually feel very personally hurt by it."
More top news
It comes after security was stepped up around the country following the Manchester Arena attack which killed 22 people.
A murderer nicknamed 'Houdini' after escaping the death penalty seven times has been given the lethal injection.
The distress signal sparked a police hunt in the area to find the person or group who made it.