Broadcast watchdog Ofcom are still investigating the Newsnight programme.
After the BBC Trust released their findings a spokesman said:
Ofcom's investigation into the Newsnight child sex abuse allegations is currently ongoing.
We will make the outcome of this investigation known in due course.
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A 61-year-old woman was taken to hospital with head injuries after the incident in Islington, north London.
The suspect is believed to have acted alone at Noblesville West Middle School, in suburban Indianapolis.