Update: 28 September 2015 at 14:32 – Aaliyah has now been found safe and well
Aaliyah is described as 4ft 5”, with blue eyes, of medium build with shoulder length hair.
She was last seen wearing black leggings, black pumps with diamantes around the ankle, a blue school polo shirt and a blue jumper with Hobmoor School badge on it and a black parka coat.
Anyone who has seen Aaliyah is asked to contact North Yorkshire Police as a matter of urgency.
Dial 101, press 1 and pass information onto the force control room.