ALTUS, Okla. (AP) — A manhunt was underway Wednesday in Missouri for a couple wanted on child abuse and other charges after authorities in Oklahoma found one of their children dead and three others in critical condition.

St. Louis police on Tuesday asked for the public's help in locating Hakim Mustafa Moore, 27, and Robin Alexander, 29.

The couple's last known address was in Altus, Oklahoma, about 640 miles (1,030 kilometers) from St. Louis. Police in Altus received a tip that Alexander and Moore had fled to St. Louis to avoid capture after an arrest warrant was issued June 10.

The U.S. Marsha...