Police were called shortly before 3pm today to the River Calder in Brighouse.
The air ambulance is reported to have landed on the scene and a huge emergency services presence remains at the scene.
A spokesperson for West Yorkshire Police said: "Police were called at 238pm to reports of a child in the River Calder in Brighouse.
"Officers are currently at the scene with various partner agencies and this remains an ongoing incident."
Yorkshire Air Ambulance has been contacted by the YEP.
More to follow.