Police are dealing with a report of a possible child approach which happened in the Creggan area on Monday.
Police said two men, in what has been described as a works van, spoke to a girl aged 15 and asked her to get into the vehicle. She ran off.
The incident happened at around 4pm.
A PSNI spokesperson confirmed: “Police are investigating this incident and ask the community to report any similar suspicious activity immediately on 101 or 999.
“Anyone with information about this particular incident is asked to call 101, or Crimestoppers on 0800 555 111.”