The Times newspaper has published data distributed under freedom of information laws that suggests illegal "sexting" was going on at The Nottingham Academy.
The newspaper said statistics from more than 50 of Britain's biggest secondary schools showed that more than a third of all sexting cases involved children aged 12 and 13, with tens of thousands of schoolchildren caught sharing sexual imagery online in the last three years.
Sexting means people sharing indecent images via a mobile phone or uploading them on a social networking site.
The Times highlighted suspected cases at schools nationally, including at The Nottingham Academy.
The Times claims figures identified "possible gang grooming" as a motive for one sexting case at the school, which has sites in Greenwood Road and Sneinton Dale, Sneinton and Ransom Drive in Mapperley, and also claims another minor was caught sending "inappropriate images" to a member of staff.
The Times says it asked 50 schools for details of sexting cases since 2012 and the national results received showed 1,218 pupils had either sent or received a sext. It adds that more than one in 10 national cases involved a "non-school adult".
Susi Artis, assistant secretary of Nottingham City National Union of Teachers (NUT), said: "Teachers would obviously be very concerned about that. I would hope the Academy would respond appropriately and deal with it - it's not something you want to see in schools, it's horrible."
She added that it was tough to balance a need to have mobile phones in schools as youngsters may need to contact parents, to say they are staying behind after school, for instance, but pupils need to be using their phones responsibly.
In the Times' piece, Maria Miller, former culture secretary who chairs the women and equalities select committee, called for compulsory sex education to tackle the "appalling" effect sexting was having on girls and boys.
But Ms Artis said: "I think schools do do sex education and they revise the curriculum all the time as things develop and evolve. I think schools do a brilliant job. I don't really think Maria Miller knows what's going on in schools if she is saying that.
"All these issues are dealt with in PSHE (Personal and Social and Health Education)."
The National Crime Agency said last year that sexting is now the norm among teenagers.
A campaign was launched to deal with an increase in the number of cases of children sharing sexually explicit images and videos, and to give advice to concerned parents.
In 2014, Nottinghamshire Police said the force was sending letters to all schools in the city and county, saying it has "grave concerns" about "sexting".
There is no doubt that the increase in Muslims in this country has made this worse due to their incessant love of kiddy fiddling. Vote BNP to put a stop to this - we are the only politically party with the balls to stop the Muslim invasion.
