Police in Derry concerned for missing 12 year-old

Police in Derry say they are concerned for the welfare of missing person Erin Stockman.
The 12 years old was last seen near McDonalds, Strand Road around 6.30 pm on Saturday evening.
She is 4’6”, long light brown hair wearing glasses, Black Hooded Top, Denim shorts, Black Vans shoes.
If you have any information to help us find her please ring 101 reference number 1423 08/04/17