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FAR ROCKAWAY, Queens — Smoking caused the Queens apartment fire that killed a 12-year-old boy on Sunday, according to the FDNY.

Fire marshals reported that the cause of the fire was accidental and related to smoking. The building’s smoke alarm was also not operational.

The fire broke out on the fifth floor of 122-20 Ocean Promenade just after 3 a.m.

After firefighters put of the blaze, Thomas Curly, 12, was found unconscious and unresponsive inside. He was rushed to the hospital where he was pronounced dead.

Eight other people suffered minor injuries.