The aquarium at Dubai Mall, one of the world's largest is leaking and part of the mall has been evacuated, a police official said on Thursday.
"There was a small problem, a simple crack, and the water leaked," the official said, declining to be identified.
One of the largest tanks in the world, the aquarium features the world's largest viewing panel at 32.8 metres (107 ft 7 in) wide and 8.3 metres high.
Dubai Aquarium has been planned to have more than 33,000 living animals, representing more than 85 species including over 400 sharks and rays combined, according to Dubai Mall's website.
A Reuters witness said the mall had been partly evacuated and dozens of emergency vehicles were outside the mall, billed as one of the world's largest and operated by Emaar Properties.
An Emaar spokeswoman confirmed it was investigating an incident at the mall.
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