She was last seen on Monday, August 6 at around 1pm in the Creggan area of the City.
Leah is 14 years old and wearing an olive tracksuit.
“If you have any information of her whereabouts please contact police and quote incident reference 1561 of 06/08/18,” said a police spokesperson.
There have been a number of reported sightings of Leah in the Beechwood area, Foyle Street and Pilots Row.
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