MORE search crews have joined the desperate search for three-year-old boy William Tyrell, missing from Kendall since Friday.
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William was playing in the front of his grandmother's home in his Spider-Man costume when he disappeared.
The search, now in day four, has been bolstered by even more State Emergency Service volunteers - this time from Sydney - who have joined the hundreds of police, volunteers and community members who have been searching the area south of Port Macquarie since William disappeared at 10.30am on Friday.
The large-scale search, which continued throughout Sunday night, has so far failed to turn up any trace of William.
Superintendent Paul Fehon said on Sunday afternoon that, despite painstaking searching by hundreds of emergency services workers and volunteers, the little boy's chance of survival was steadily decreasing.
"As time passes that window does diminish," Superintendent Paul Fehon said.
A family friend, speaking on behalf of William's parents, said they were desperate to find the child.
"William is a much-loved and cherished little boy," said the friend, who wanted to be known only by her first name Nicole. "The family are desperate to have him home, and if anyone knows anything please contact police."
Police are saying that his chances of survival are diminishing steadily as the days progress.
Inspector Kim Fehon said police were looking into other scenarios and are keeping an open mind in relation to the case and cannot rule out the possibility he was abducted.
Police from Mid North Coast Local Area Command are coordinating the search, which has included SES volunteers, RFS volunteers, members of the local surf lifesaving club, the police dog squad, mounted police, officers using trail bikes and PolAir.
William has been described as being of Caucasian appearance, with dark hair and hazel eyes.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000.
Source: Port News