Updated

Officials say a man is under arrest after he sneaked into the San Francisco Zoo's grizzly bear exhibit. The man had no contact with the bears and was rescued without major injury.

Zoo spokeswoman Gwendolyn Tornate says the man entered the exhibit — which is surrounded by glass walls and electric fencing — on Saturday night.

Tornate says a shooting team fired a warning shot to keep the bears at bay and staffers secured the animals inside their dens.

Tornate says the man was unresponsive but conscious and had no serious injuries.

The man was immediately taken into custody by police, who are investigating the incident.

On Christmas 2007, a 17-year-old boy was killed at the zoo by a tiger that escaped.

Mayor's spokesman Nathan Ballard says that Saturday's response shows that safety procedures are working.