Dozens of baboon monkeys fled their barn at the Paris Zoo on Friday, prompting the authorities to evacuate the park and begin a campaign to search for it with the help of police.
Park officials said in a statement they had issued a warning after an employee of a monkey was surprised inside a corridor.
Reports said the number of runaway monkeys was approaching 50.
Officials said garden staff and police officers began a search for four monkeys that were still free. They pointed out that citizens did not see any of them in public areas.
In November, Paris saw a tiger escape from a circus and walked through the city streets until he was shot dead