YANKTON, S.D. (AP) — Authorities are continuing to search for a 6-year-old southeastern South Dakota boy believed drowned in the Missouri River on Easter.

Lincoln Hilt, of Hurley, went missing Sunday night while fishing with family from the docks at a city park in Yankton. He had received a fishing pole in his Easter basket Sunday morning.

Yankton Police Chief Brian Paulsen says South Dakota and Nebraska officials taking part in the search are using several boats and will use airplanes weather permitting.