A group of men, women and children were victims of a horrifying piranha attack on Christmas Day in the Parana River in Rosario, Argentina.

At least 70 people were injured, including children who were bathing in the river to cool down from the heat.

From the AP:

Director of lifeguards Federico Cornier said Thursday that thousands of bathers were cooling off from 100-degree temperatures in the Parana River in Rosario on Wednesday when bathers suddenly began complaining of bite marks on their hands and feet. He blamed the attack on palometas, “a type of piranha, big, voracious and with sharp teeth that can really bite.”

A paramedic on the scene said some children had lost entire fingers and toes in the fish attack.

Our fish coverage at For the Win is usually a lighthearted affair, but this is clearly a really sad story. Be careful in the water, everyone.