text: Lesley Conman's daughter Abbie, 12, was sent sexualised messages by an online pervert on Facebook . Two mothers have slammed police for failing to act after their daughters were targeted by an online predator. Both Lesley Conman and Kerry Green's young daughters were sent sexualised messages by an online pervert on Facebook - but police refused to investigate as no offence had been committed. Ms Conman's daughter Abbie, 12, was sent a message by the man after accepting a friend request from someone pretending to be a 17-year-old boy. After the horrified mother saw the provocative messages, she challenged the man herself, pretending to be Abbie. Ms Conman, 34, from Hull, said: 'There were four or five messages that he sent, before he actually blocked me. I think I scared him. 'You can only find my daughter on Facebook if you have a mutual friend and this guy was friends with 100 of her school friends, so she thought he was from school.' After tackling the pervert, Lesley posted the messages on her own account to warn other parents of the dangerous predator. She said: 'I shared it because I would say 90 per cent of my daughter's school were on his profile and he was talking to her friends and his profile had about 300-400 friends and they were all under 15.' In the case of Ms Green's daughter Emily, 13, the sick man threatened to post explicit pictures on her Facebook wall - which all of her friends would have then seen - if she did not play along with his sordid messages. The pictures were not of Emily, but it is thought that he planned to post them online as if they were her. Ms Green, from North Newbald, East Yorkshire, said: 'When I first saw the messages I flipped out, but I didn't to play the role of a paedophile hunter and lead him on because I didn't want him to think that my daughter was interested in him in anyway at all.' Ms Conman challenged the man (pictured left and writing in grey) when she found the messages on Abbie's Facebook (Abbie's messages in blue) After the horrified mother saw the provocative messages, she challenged (in blue) the man (writing in grey) herself, pretending to be Abbie . Both mothers contacted Humberside Police but the force did not take any action on either occasion. Ms Conman was told that no offence had been committed so officers could not do anything about the messages. She said: 'I felt disgusted by it. If nothing is done then surely we are sending a message out to these men that this is acceptable.' Ms Green, who says the police never responded to her complaint, said: 'It was upsetting and annoying. I understand they can't follow up everyone of these case because it takes a lot of time, but if they did chase them up there would be less of them.' Both mothers admitted that they do not like their daughters being on Facebook, but they'd rather allow it than running the risk of the girls setting up a secret account. A Humberside Police spokesman said: 'Unfortunately, there are people out there that do want to engage with people who are younger than themselves. 'Young people can help themselves by not engaging with them. Parents have a role to play in it, children have a role to play in it and we have a role to play in it once a crime has been committed. 'We are aware of Mrs Green's complaint and we have taken it seriously and given her advice as to how to prevent this happening in the future.'
target: Young girls were sent sexualised Facebook messages but police didn't act .
  Abbie Conman, 12, and Kerry Green, 13, were targeted by online predator .
  One of the mothers challenged the man, who was pretending to be 17 .
  Police said no crime was committed when the mothers reported the man .