A maths teacher who groomed one of his pupils on Facebook and carried out a string of sex attacks on two other young girls has been jailed for 15 years.
Anthony Dockerty, 41, was told he was a "manipulative" man who used his position as a teacher and his vastly superior difference in age to target his victims.
Dockerty, who was dressed in a black leather jacket, blue shirt and dark trousers, showed no emotion as he was jailed at Hull Crown Court. Relatives of his victims applauded and jeered as he was led away.
The court was told Dockerty sent one of his 15-year-old pupils 150 messages, many of which were of a sexual and highly inappropriate nature.
He would tell her she looked "gorgeous", that he wanted to "grab her and bite her neck" and warned her to delete the messages in case someone would discover them.
The court was told the teenager developed a "crush" on Dockerty and she would often leave a folder behind at the secondary school so she could come back and collect it and meet him alone.
She once told him she thought he looked depressed and asked what was wrong. He suggested she look on his Facebook page and the relationship developed.
The pair eventually agreed to meet up at his house where he gave her a tour of the property before taking her upstairs to his bedroom where he kissed and fondled her, the court heard.
A woman, who had access to Dockerty's Facebook account and who grew increasingly concerned about the nature of the messages she was reading, alerted the police.
Dockerty was also made him the subject of a sexual offences prevention order which severely restricts his contact with young people and bans him from working with children.