Eight people including a baby have died in a fire at an eight-storey building in south-western Paris, fire service officials say.
Nearly 30 people - including six firefighters - were injured. One person is in a serious condition.
50 people were evacuated by ladders from the blaze in the upmarket 16th arrondissement.
The Paris prosecutor says it may have been deliberately started. Police have detained a female suspect.
While the fire was raging, a police source says she was suspected of trying to set fire to a car parked nearby. The suspect, who lived in the building, was reportedly drunk and is said to have justified her actions as the result of a conflict with a neighbour.
Housing Minister Julien Denormandie said the 40-year-old woman was known to psychiatric services.
The fire was brought under control after a five-hour operation, but the death toll could still increase, a fire service spokesman told the AFP news agency.