Four of those hurt were in serious condition, the Berlin fire department said in a statement.
The cause of the boat's roof collapse was not immediately clear and is being investigated.Â
Around 120 guests were on board the event boat anchored in the Spree river near Berlin's Fisher Island (FischerInsel) when the roof came down, they said.
"A total of four people were seriously injured and five people were slightly injured" and had been taken to hospital, they said. A number of people also received treatment at the scene.Â
Dozens of emergency workers were sent to the scene shortly after 9:00 pm and a rescue boat was deployed to help search for possible victims, "But there were no people in the water," the statement added.
Germany's top-selling Bild newspaper quoted an unnamed eyewitness as saying a concert had been taking place on the boat.
According to local broadcasters, the ship is firmly anchored in the harbor and is also used as a gallery.Â
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