ST. PAUL, Minn. (AP) -

Authorities in St. Paul say they've recovered the body of a child missing since a rockslide killed a classmate and left two others injured at a park along the Mississippi River.

Assistant Fire Chief Jim Smith tells reporters that crews found the body of the missing child late Thursday morning.

Rain-saturated soil gave way Wednesday afternoon as the boy and other fourth-graders from a St. Louis Park elementary school walked along a path in Lilydale Regional Park. They were on a fossil-hunting field trip.

Another child died in the landslide. Authorities say one child remains in serious condition in a hospital.

St. Paul Mayor Chris Coleman says an area of a park where the children were killed is now indefinitely closed. Coleman said at a news conference Thursday that "our hearts, our minds, our prayers and our thoughts go out to the families" of the victims.

The mayor calls it "a tragic day for St. Paul."