The CPSC explained that water beads can contain dangerous levels of a toxic chemical called acrylamide ... and why pediatricians say children shouldn't play with water beads at all.

THEY SAY IT HAPPENED LAST NIGHT ABOUT 5:00 AFTER PLAYING ON A FROZEN POND. FAMILY MEMBERS HELPED GET THE TWO OTHER CHILDREN OUT OF THE WATER, AND SEVERAL AGENCIES RESPONDED TO THAT INCIDENT ...

Pollution is everyone's problem. For more disturbing photos of polluted areas, check out these images of China's contaminated water systems.

They shared photos of where the kids were playing and running water is now visible on those parts of the river. Parents are asked to talk to their children about their safety on the ice.