Detectives in Maryland are asking for help finding two young children who haven’t been seen since Thursday.

Malachi Mobley, 3, and Bria Whittaker, 6, were last seen in Germantown with their grandmother, Lisabeth Mobley, the Montgomery County Police said Saturday.

NBC Washington said the grandmother is also missing.

Police described Malachi as about 3 feet 2 inches tall and 37 pounds with brown eyes and black hair. Bria is 3 feet 6 inches tall, 35 pounds with brown eyes and black hair.

Investigators are concerned because of the children’s ages and the length of time they’ve been missing.

Anyone with information is asked to call the non-emergency number for the Montgomery County Police, (3010 279 8000. Callers may remain anonymous.

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[Featured image: Malachi Mobley, Lisabeth Mobley, Bria Whittaker/Montgomery County Police]