Baby gorilla crushed to death by closing hydraulic door at San Francisco Zoo

SAN FRANCISCO -- An accident at the San Francisco Zoo has claimed the life of its youngest gorilla. Kabibe was barely more than a year old. She died Friday as zoo staff put the animals away for the night.

As Kabibe was being put into her sleeping area, zoo officials say the young gorilla darted out and was crushed by a closing hydraulic door.

Kabibe had been one of the zoo's stars and was a rare example of a birth in captivity.

This summer, the zoo even celebrated her first birthday by treating the whole gorilla preserve to fruits and other goodies.

VIDEO: 1-year-old gorilla celebrates birthday at SF Zoo

Zoo officials would not speak publicly about the incident. But in a statement said: "This type of accident is extremely rare and the zoo wishes to assure the public that all animal care protocol at the facility is specifically designed with animal safety as the top priority.

Zoo administrators say they're investigating exactly how this happened.

This is the latest in a string of incidents involving San Francisco Zoo animals.

In Dec. 2011, a squirrel monkey named Banana Sam went missing. A zoo spokesman says someone broke into his enclosure and took him, but he was returned a couple days later. Banana Sam died last year from heart disease complications.

And in 2007, a Siberian tiger named Tatiana escaped her enclosure. The big cat killed one spectator and injured two others.