Police are urgently searching for Ellie, also known as Elliott, who is missing from Horsham.
The 14-year-old was last seen leaving home around 7.30am on Monday (October 11) but failed to turn up at school as expected.
They are described as white, approximately 5' 2" in height with short, light brown hair. When last seen, they were wearing a black blazer, white blouse, black trousers and was carrying a black bag.
Anyone who sees them or who has any information as to their whereabouts is asked to dial 999 quoting serial 465 of 11/10.