The bodies of the two girls and their parents and friends were recovered late last night. The fire was said to have raged for some time before it was spotted by neighbours 500 metres away on Sunday morning.
"It is very unusual that so may people die in a house fire. In around 95 percent of cases, it is one person who dies. Sometimes it is two, but more than that is uncommon," says Mattias Strömberg, accident researcher at the Swedish Civil Contingencies Agency (MSB) to news agency TT.
He told TT that a couple of fires in 2009 stood out from the statistics. A house fire in Staffanstorp where a family of five perished and an apartment building in Rinkeby where seven people lost their lives.