The death of a 1-year-old girl found unconscious in her family’s apartment in Queens was not the result of a dog mauling, the city’s medical examiner ruled, as the mysterious circumstances of her death are now being investigated.

A Queens family is reeling after their 1-month-old baby girl was fatally mauled by their 6-month-old puppy as the family slept on Tuesday morning. Police were called to the Long Island City home on 12th Street near 41st Avenue just after 6:30 a.m., the New York Police Department's press office tells PEOPLE.

The death of an infant girl in Queens was not caused by a dog mauling as originally believed, sources tell CBS News New York. Police officers were called to a Long Island City apartment early Tuesday morning for reports of a German Shepherd-pit bull mix puppy mauling a 1-month-old child.