Eight people 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.
It is not clear what caused the blaze in the upmarket 16th arrondissement, near the Parc des Princes soccer stadium.
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
. 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.
The death toll could still increase, a fire service spokesman told the AFP news agency.
'Apocalyptic situation'
The fire spread across the two floors of the 1970s building shortly after 01:00 (00:00 GMT), forcing some residents to scramble on to nearby rooftops to escape the flames and smoke.
About 250 firefighters were deployed to the scene not far from the Bois de Boulogne park, helping to rescue those trapped on the roofs. Approximately 30 people were evacuated with ladders.
"When we arrived, we were faced with an apocalyptic situation. Lots of people were calling for help from the windows", the spokesman said.
, reports French broadcaster BFMTV.
Surrounding buildings in the area have been evacuated as a precaution.
, reports Le Parisien newspaper. Nearby roads have been blocked.
The mayor of Paris,
.
The city council plans to honour the victims with a minute's silence at 11:00.
Just a few weeks earlier,
in the centre of the city.