A British zoo has evacuated all visitors after a fire broke out in its Monsoon Forest section, the largest indoor zoological building in Britain.
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Pictures on social media show flames and plumes of smoke emerging from Chester Zoo, in northern England.
"Visitors have been evacuated and asked to leave the zoo as teams work to bring the situation under control," the zoo said on Twitter on Saturday.
"The zoo's animal teams are working to move all animals away from the incident."
Chester Zoo is home to 21,000 animals across 50 hectares, attracting 1.9 million visitors a year, its website said.
The STG40 million ($A70m) sub-tropical Monsoon Forest section is home to animals including Sumatran orangutans, macaques, snakes and crocodiles.
Last December, a large blaze at London Zoo killed an aardvark and four meerkats, and damaged a shop and cafe.
Australian Associated Press