Huge Berlin hotel aquarium has glass wall smashed; 2 people injured, 1,500 fish killed.

A huge aquarium collapsed inside a hotel in Berlin on Friday, causing "absolute destruction" and the loss of about 1,500 tropical fish, officials said.

The AquaDom aquarium, a 50-foot-tall cylinder-shaped aquarium with a built-in elevator located at the Radisson Collection hotel in Berlin, collapsed near 6 a.m. local time, officials said.

The mayor of Berlin, Franziska Giffi, said in a statement:

"The causes are not yet clear, but despite this, we can say that it was a genuine tsunami that flooded the hotel, the adjacent restaurants. "

The incident injured two people, a hotel employee and a guest, who are being treated in hospital, the hotel group said'''Radisson.

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"We offer our full support to the injured guest and our colleague and wish them a speedy recovery," the company said in a statement. "Members of our leadership team are on the scene and are working with authorities to investigate the cause of the accident. "

Mayor Giffey said none of the fish could have been saved.

"If this had happened not at 5:45 a.m. but just an hour later, we would have had to report a formidable amount of damage to people," she said.

"This is a situation that really caused absolute devastation. "

Video of the aftermath of the aquarium rupture shows water filling the hallway and smoke billowing outside. Ruins are also strewn across sidewalks and the street in front of the hotel. The hotel is closed until further notice and guests are being transferred to''other locations,' the Radisson Hotel Group said in a statement.

SEA LIFE Berlin, located near the AquaDom aquarium, included in its tickets a visit to the attraction as "the largest free-standing cylindrical aquarium in the world".

"We recognize the unprecedented incident that occurred at AquaDom, the unique structure next to our aquarium," said Marcel Cloos, regional manager of Merlin Entertainments, which owns SEA LIFE Berlin. "Our teams at SEA LIFE have offered support to the AquaDom teams as our priority is the safety and well-being of all people and animals associated with this incident. "

SEA LIFE Berlin is temporarily closed due to the incident at AquaDom, the company said on its website.