The collapse happened Saturday night at an apartment in a recently constructed building, the Angers prefecture said. One of the injured is in serious condition.
The victims were three men and a woman aged 18 to 25, according to the Angers' prosecutor, Yves Gambert. Seven people remained hospitalized on Sunday afternoon, he added. About 30 people had gathered in the apartment for a housewarming party when the balcony "suddenly collapsed", he said.
An investigation has been opened to establish the cause of the collapse. A building expert went to the site, Gambert said.
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