A former supply teacher has pleaded guilty to taking more than 100 upskirt photos of pupils.Abusali Rahman, 36, admitted 21 offences at Bolton Crown Court on Thursday.Appearing via videolink from HMP Altcourse, Rahman pleaded guilty to 12 counts of taking indecent photographs of children by upskirting, four counts of publishing an obscene article, three counts of making indecent photographs of children, one count of voyeurism and one count of distributing an indecent photograph of a child.Rahman, a British national of Bangladeshi ethnicity from Salford, worked at schools across the North West.He will be sentenced on 1 September.Defence lawyer Emma Kehoe said: “Mr Rahman knows this is a prison sentence but he was going through a mental health crisis at the time.”She asked for a psychiatric report ahead of sentence.Recorder Geoffrey Lowe said: “This is a complex case.”Greater Manchester Police said Rahman was arrested in June 2025 after a parent raised concerns when an image of their child in school uniform was circulated on social media.Speaking outside court, Detective Sergeant Simon France said the guilty pleas were the result of a “painstaking, thorough investigation”.He said: “We first received reports of Abusali Rahman’s suspected offending in March 2025 and he was arrested in June that year.“The offences are alleged to have taken place in several secondary schools across the North West between December 2023 and 2025.“The officers and staff working on this investigation, including our victim identification team, have put everything into building a case against Rahman and bringing the charges against him.“This included our digital investigation unit which has analysed around 1,000 images over the past year.”He said police had been in contact with all the schools Rahman had worked in since he became a qualified teacher in 2023.