article_snippet.sent: Now, investigators are apparently trying to determine where a loaded gun came from - and the identity of the person responsible for bringing a loaded gun into the house and leaving a loaded gun within the toddler's reach.
article_snippet.sent: A three-year-old can't be held accountable for a tragedy like this. '
article_snippet.sent: There have to be adults that either supplied the weapons, had charge of the weapons or knew the weapons were there and didn't do anything to safeguard the weapons.'
article_snippet.sent: Investigation: The child, who has not been identified, fired the weapon after discovering the weapon inside the house in East 63rd Street, where s at least one adult were reportedly staying.
highlights_snippet.sent: It is unclear whether victim was related to the youngster who shot victim .
  
highlights_snippet.sent: Police are trying to determine who left weapon within the child's reach .
  