MILWAUKEE (CBS5 8) -- Milwaukee police are searching for a missing 4-year-old boy who may be with his 12-year-old sister, who is wanted and may be armed, according to police.

Nevin Powell was last in contact with his guardian Tuesday night, Dec. 2, police said. He is believed to be with his sister, Sanuya Wooten-Powell. Both were last seen traveling on foot southbound from the area of Hadley and Dr. William Finlayson St. in Milwaukee.

Nevin is a 4-year-old Black boy, standing around 3 feet tall and weighing around 50 pounds with brown hair. He was last seen wearing blue jeans and a navy-blue shirt with no jacket or shoes.

Sanuya is a 12-year-old Black girl, standing around 5 feet 5 inches tall and weighing around 130 pounds with red hair. She was last seen wearing a black jean jacket over a black hooded sweatshirt and blue jeans. She is wanted and may be armed, according to police.

The two may be traveling in a silver or light blue Hyundai Santa Fe with no license plate. Anyone with information is asked to call Milwaukee Police District 5 at (414) 935-7252.