A judge has jailed a boy who barricaded his teacher inside a classroom and sexually assaulted her when he was just 14.
The teenager, who cannot be named for legal reasons, was a pupil at a school in Wrexham, north Wales.
The teacher was heard screaming for help by her colleagues who attempted to break down the door to the school's computer room where the boy was attacking her.
The Mail reports that they eventually pulled the 'distressed and terrified' teacher to safety.
Mold Crown Court heard that the youth put his hand up the woman's skirt and forced himself on her while laughing.
Prosecutor Karl Scholz told the hearing: "The teacher and the boy were in the classroom when he closed the door and snapped the latch shut. He told her he had things on his mind and took hold of her and hugged her. She managed to get away and wanted to leave the room but realised the door was locked.
"The schoolboy then put his hand up the teacher's skirt and carried out a serious sexual assault on her."
Mr Scholz added that staff outside the room could hear their colleague screaming and the boy laughing.
The court heard that the teacher was so traumatised by the incident that she has been unable to return to work at the 700-pupil school.
Defending the boy, Steven Edwards said he had suffered a difficult childhood and had been the victim of abuse himself.
Now 15, he has been sentenced to four years in a youth detention centre for the assault, which he carried out while on bail for another sex attack, and with two other sexual convictions to his name.
Judge Greg Bull QC also placed him on the sex offenders' register for life, and told him he had subjected his teacher to a 'terrifying experience'.