A woman has been arrested as part of an investigation into a fire in an apartment building in Paris that killed at least ten people and injured about 30.
The blaze broke out in the eight-storey structure on Rue Erlanger, near the Parc des Princes stadium and the Roland Garros French Open tennis venue in the capital's 16th district.
Paris prosecutor Remy Heitz told reporters that investigators suspected a "criminal" cause for the fire and that a 40-year-old woman was in custody.
"One person who lives in the building has been arrested. She's a 40-year-old woman who has prior psychological problems," Mr Heitz said.
French television showed video of flames in the windows of the building, which authorities said was built in the 1970s.
"It was a particularly violent fire," Captain Clement Cognon of the Paris fire service told BFM TV.
Emmanuel Gregoire, an official with the city government, said the victims were residents.
The fire began on the top floors of the eight-storey building at around 1am local time.
It was brought under control more than five hours later by around 200 firefighters.
"France is waking up with emotion after the fire on the rue Erlanger in Paris," President Emmanuel Macron tweeted. "Thoughts for the victims. Thank you to the firefighters whose courage helped save many lives."
The fire is the most deadly since 2005 when an arson at a building in the 13th district of the city killed 17 people, including 14 children.
The blaze follows a powerful gas explosion last month that killed four people in the city's central 9th district.
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