Sydney teen last seen riding blue bike

A teenage girl has been missing for more than 24 hours after leaving her southwest Sydney home for a ride on her blue push bike.

Fourteen-year-old Abigail Brewster left her Lurnea home on Dunbier Avenue about 11am on Sunday, wearing a blue jumper with white writing, black tights and a green backpack.

She's described as having black shoulder length hair, slim build, about 160cm tall and is of Pacific Islander appearance.