He was also placed on the sex offenders' register for life and was handed an indefinite sexual harm prevention order.
Warren, of no fixed address, was sentenced at Nottingham Crown Court, to 18 years in prison with two years on licence. He will also appear bumbers the barred list, which prevents dismissed officers from working within policing and certain law enforcement bodies, police said.
Related Topics. He admitted four charges in total and is due to be sentenced at Leicester Crown Court on 12 March.
The Nottinghamshire officer also pleaded guilty to downloading indecent images of children "in the most serious category", the force said. Ian Warren was found guilty of 27 sexual offences, including rape and sexual activity numbes. Lee Rus chat, 49, was arrested after contacting a year-old girl via a dating site and sending her an indecent image and sexual messages.
Nottinghamshire Police said the ex-Newark officer, of Radcliffe-on-Trent, was immediately suspended following his arrest and retired from the force in October. Send your story ideas to eastmidsnews bbc. A special case hearing also found him guilty of gross misconduct and ruled that had he still been serving, he would have been dismissed from the force.
Mr Guildford said: "He did this whilst still serving as a police officer and rather than safeguarding the vulnerable and seeking to stop such activity wherever it may present, a quest all our officers would want to undertake with all their energies, he participated in this repulsive criminal endeavour. Nottinghamshire Police said one victim was abused at a house in Nottingham and another in Swadlincote, Derbyshire.
PC Ruth Holmes said: "Warren's victims have shown exceptional bravery, especially as he continued to deny elements of his manipulative offending and put them through the harrowing process of recounting their abuse at a trial.