The Queens blaze that killed a 16-year-old girl and severely injured her mother the day after Christmas was caused by an unattended candle and a lack of smoke alarms, the FDNY said Friday.

The flames had broken out around 8:30 p.m. Wednesday and tore through the family’s third-floor apartment on Merrick Boulevard.

The blaze, which has been ruled accidental, flourished because no smoke alarm was present in the home, and it ended up killing Lamonies Smith, 16 and left her 56-year-old mother in critical condition, officials said.

The family’s 76-year-old neighbor was also sent to the hospital with serious injuries, and two fire fighters suffered minor injuries from the inferno, authorities said.

The FDNY reminded the public to never leave a candle unattended and always ensure there are working smoke alarms in the home.