This is what I found on NYPost.com:

LONDON — Zookeepers say a group of chimpanzees used branches weakened by a storm to make a ladder and escape from their enclosure at the Belfast Zoo.

Video filmed Saturday by visitors to the Northern Ireland zoo showed several primates scaling a wall and perching atop it, with one walking down a path outside the enclosure.

Zookeeper Alyn Cairns said trees in the chimps’ enclosure had been weakened by recent storms, allowing the animals to break them and fashion a ladder to escape. He told the BBC “they’re intelligent primates and know they’re not supposed to be out of their enclosure, so got back in themselves.”

Information provided by NYPost.com.

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