A school of carnivorous fish injured 70 people bathing at a popular beach in Argentina, including seven children who lost parts of their fingers or toes, according to People.
The attack was blamed on palometas, "a type of piranha, big, voracious and with sharp teeth that can really bite." It happened off the popular beaches of the Parana River near Rosario, 186 miles north of Buenos Aires, where thousands were cooling off from 100-degree temperatures.
"This is not normal," said Federico Cornier, the director of emergency services in the city of Rosario. "It's normal for there to be an isolated bite or injury, but the magnitude in this case was great ...this is an exceptional event."
According to People, officials say the heat wave is part of the reason why theon the river's surface.