Security is to be reviewed at Belfast Zoo following a break-in on Monday night.
Zoo manager Mark Challis said police were called after intruders released ponies from their enclosure.
The animals were not harmed and were quickly recaptured within the zoo grounds.
A number of tweets that appeared on Monday night claiming that a tiger or giraffe had been freed from their enclosures proved to have been false.
"A number of youths entered the zoo around 8 o'clock we think. They were seen by our security staff on the site," Mr Challis said.
"They actually broke into our farm building in the zoo where we keep domestic animals and released three Shetland ponies.
"We obviously contacted the PSNI and I understand they have apprehended two youths."
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