Missing three-year-old William Tyrrell may have been a victim of a "paedophile ring", police say.
"One of those lines of inquiry relates to people we suspect being involved in a paedophile ring," Homicide Squad Commander Mick Willing told reporters on Friday.
The media conference followed the release of a video where William's parents beg for the return of their son, who disappeared from his grandmother's yard in Kendall on the NSW mid north coast last September.
"Just give him back ... take him to a church, take him to a police station, take him to school. Give him to someone, give him back," his mother says.
Detective Superintendent Willing said a team of detectives from the homicide squad, the sex-crime squad and the mid-north coast local area command was pursuing numerous lines of inquiry, including the pedophile ring.
"We are vigorously pursuing that line of inquiry," he said.
"This investigation is moving at a very fast pace and we are pursuing every lead that we get.
"If anyone has any information we urge them to come forward."
Detective Willing said police are "determined to work out what has happened".
