A woman was arrested following an apartment fire in Paris that killed ten people and left dozens injured.
Prosecutor Remy Heitz said the investigation "has just begun" and it was too early to determine the cause of the overnight fire, but that arson is suspected.
The 40-year-old woman, who lives in the building, was detained nearby after an attempt to torch a car. She was drunk when arrested by police and is said to have a history of mental health problems and has since been place into a psychiatric infirmary in the French capital.
A fire spokesperson said the fire broke out early on Tuesday in an eight-storey apartment building on Rue Erlanger in the 16th arrondissement of western Paris.
The Fire Brigade said they had never seen a fire spread so fast, indicating that many fires may have been set.
Ten people have been confirmed dead and 30 injured, including eight firefighters.
About 50 people were safely rescued from the building in western Paris.
Mr Cognon said firefighters rescued a number f people who had fled to the roof or climbed out of windows to escape the flames, and evacuated others from inside.
The emergency services are working to prevent the building collapsing.
Witness Jacqueline Ravier, who lives across the street, said flames were shooting from the top of the building as smoke-covered victims fled.
“I heard a woman screaming in the street, crying and screaming for help,” she said.
She added shaken residents were brought to her building and the one next door while firefighters continued to fight the flames.
“We feel the smoke,” she said. “What’s surprising is how long it lasted.”
The building is less than a mile from the Roland Garros stadium that hosts the French Open tennis tournament, and close to the popular Bois de Boulogne park on the city’s western edge.
The 16th arrondissement is one of the most high-end districts of Paris.
More than 200 firefighters and emergency workers are on the scene, Paris police said, and the street is blocked off.
People in neighbouring buildings were also evacuated.