Two lions killed after mauling naked man who entered pen.

Two lions put to death after mauling naked man who entered pen.

Two lions were killed after they severely mauled a man who stripped naked and entered their enclosure in an apparent suicide attempt early on Saturday, authorities said.

Director Alejandra Montalba of Santiago's Metropolitan Zoo told local media the park was crowded with visitors at the time of the incident.

The 20-year-old man broke into the enclosure, took off his clothes and jumped into the middle, horrifying other visitors who witnessed the attack.

"The zoo has an established protocol because people's lives are very important to us," said Montalba, adding that there were no fast-acting tranquilizers available to stop the lions from mauling the man.

An apparent suicide note was found in the man's clothing, said Metropolitan Park director Mauricio Fabry.