Fire in Rouen, in which victims were apparently overcome by toxic gases, is thought to have been caused by candles on a birthday cake.
The cause of the fire, which struck the seventh floor of the building in central Paris and spread through the attic to the roof, was not immediately known.
Two children were victims of the blaze in the north of the French capital, which 'could have been' started deliberately say officials.
Several levels of the popular Cité des Sciences were damaged by the fire that broke out for unkown reasons in a section under construction.
The roof and the back of the 19th-century building, dedicated to religious martyrs St Donatien and St Rogatien, were left severely damaged.
A fire in the load of a truck shut down tunnel services on Saturday, but reduced services at least were expected to restart Sunday.
Three of the deaths were due to hypothermia as temperatures fell to minus 14°C in some areas while the other victims died in a fire at a squat.
Three people are reported missing and several others injured in the blaze at a hotel residence used by seasonal workers in the French ski resort.
More than 90 firefighters battled two hours to contain the apartment fire in southern Paris early on Christmas Day.
Mediapart has obtained the recording of a public meeting in which a mayor from the right-wing UMP main opposition party is heard suggesting that Roma people should be allowed to burn in fires that break out at their camps. Luc Jousse, from Roquebrune-sur-Argens in the South of France, talks on the tape about a spate of fires at a Roma settlement in his town. 'It's almost a shame that the emergency services were called so early!' he says, to laughter. The comments were quickly condemned as 'unacceptable' by the UMP's own leadership. Jousse, who has now been suspended by his local party, said he regretted the remarks but insisted he was simply relaying the comments of a local resident. Hélène Constanty reports.
Police tried to stop the man, 43, who was declared ineligible for unemployment benefit, but he doused himself in petrol and set himself alight.
Five people, including a child, were killed in an overnight fire that swept their apartment in the suburb of Gennevilliers, north of Paris.
A French fishing boat reaches an Italian cruise ship drifting in the Indian Ocean with more than 1,000 aboard to tow it to a nearby Seychelles island.