Officers say that Vivian Cooke showed up at a house on Watts Avenue, in Severn, to take Faith and Gracie Davis, ages 9 and 8, to a party in Columbia. Police say Cooke is a family acquaintance.
At about 5:40 p.m., a family friend called the house to say the three never arrived at the party.
Cooke is described as 46 years old; 5 feet, 2 inches tall; 148 pounds; with brown eyes and brown hair. She was last seen wearing a brown sweater, a brown skirt and brown boots. She was driving a dark green 2007 Toyota 4Runner with Maryland plates 9276DA.
Officers say the investigation is still continuing at this time.