CHICAGO (AP) — Authorities say they are investigating the case of two toddlers seen dangling and later rescued from a second floor ledge of a Chicago apartment building.

Video of the Tuesday incident shows people standing with outstretched hands prepared to catch the diapered toddlers, believed to be two-year-old twins.

One of the toddlers eventually crawled back inside, and a man brought in a ladder to rescue the other. The children weren't hurt.

Denise Ochoa says she and a cousin were driving by the apartment building when they saw the scene unfolding. She says she got out the car to help and was exasperated when no one in the apartment came to the window to see what was going on.

Police responding to the call say the unidentified children were home with their mother at the time.

Illinois Department of Children and Family Services officials say the children have been placed with relatives pending an investigation.