An 18-year-old man has been arrested on suspicion of murdering a teenage girl who was found dead in an alleyway.The girl, who has been named online as 16-year-old Leonne Weeks, was found by a member of the public in Dinnington, Rotherham, on Monday morning, South Yorkshire Police said.Police launched a murder investigation and are questioning the man, from Dinnington, in connection with her death.Officers cordoned off two alleyways on Monday evening, where dozens of bouquets of flowers lay as a tribute to the teenager. Police were also seen searching a semi-detached property not far from where Leonne’s body was found. Detectives investigate following discovery of teenage girl’s body in Dinnington #Rotherham https://t.co/gmMAHylrPj— SouthYorkshirePolice (@syptweet) January 16, 2017 Detective Chief Inspector Steve Whittaker, added: “If you have any information about what happened, please come forward and pass that on to us.”We have increased patrols in Dinnington at this time to provide reassurance to members of the community and I’d urge anyone who thinks they have any information, to please speak to an officer.“While formal identification has not yet taken place, we are working closely with the family of a girl from Dinnington.”We expect formal identification to take place over the coming days and I’d like to ask both members of the public and the media to please respect this family’s privacy at this incredibly difficult time.”The force is asking anyone with information to call 101. I am incredibly sad to hear about the discovery of a teenage girl’s body in Dinnington near my constituency office this morning.— Kevin Barron MP (@KevinBarronMP) January 16, 2017 But today questions remained about whether Leonne had actually met someone, or whether she had a boyfriend.The teenager’s aunt, Jean Oldfield, 47, said: “All we know is a man has been arrested.”Our Leonne is not that type of person, I don’t know who would do this to her.”Describing her niece as a popular and quiet who would “mix about with anyone”, she added: “I don’t know if she was single or not.”Detective Chief Inspector Martin Tate, the senior investigating officer, said he could not confirm if Leonne had met a man on a date, but said officers were looking into social media for clues.Speaking at the scene, he said: “Clearly, this is a murder inquiry. We are gathering as much evidence as we can and these things take time.” When asked if Leonne had used a dating site to meet a man, he added: “I cannot comment on that. Social media is such a big place – but we are looking at social media.”Tributes were paid to the “lovely lass” on Facebook while her mother, Paula, did not say anything as she laid flowers at the scene. One user said: “Can’t even get my head over this! Such a quiet nice lass! Wouldn’t harm anybody and gets taken away at 16 years old with a while life ahead of her? r.i.p Leonne Weeks darling” (sic). Another wrote: “Thinking of you all at this sad time Paula Appley sweet dreams to your princess xx.”Kevin Barron, MP for the Rother Valley, tweeted: “I am incredibly sad to hear about the discovery of a teenage girl’s body in Dinnington near my constituency office this morning.”I would like to send my condolences to the family and friends of this young girl. We must now allow the police time to investigate.” All we know is she went to meet someone – meet a bloke [man] – and now her body has been foundMan at the scene A man who said he was her friend claimed that she “had gone to meet someone” before her body was discovered. She was reported missing by her family.The man, who wished to remain anonymous, said he was “deeply shocked” at the death of his friend as he stood by the scene.Speaking about the discovery, he said: “I used to be neighbours with her and know her really well – she’s a good mate of mine is Leonne.”We don’t know what’s happened, all we know is she went to meet someone – meet a bloke [man] – and now her body has been found.” He added: “She met him off the internet – one of those dating sites.”Asked if he knew how Leonne had died, he said: “I don’t know – all I know is the pathway is just a dead end and backs on to a few allotments down there.”Another one of Leonne’s friends who wanted to pay tribute said: “She was just absolutely sound, always up for a laugh. She was one of the funniest people I’ve ever met – she was lovely.” Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.