Bones found in Morcombe search

Investigators have found three bones during the search for Daniel Morcombe's remains on the Sunshine Coast in south-east Queensland.

Police say a preliminary forensic analysis is being conducted on the bones, which were located today in the same area that a second shoe was found on Saturday in the primary search site off Kings Road in Beerwah.

The shoe found on Saturday appears to match another found at the site last Wednesday, although police have not confirmed if the pair match the skate shoes Daniel was wearing when he disappeared eight years ago.

"Police continue to caution that the discovery of these bones and two shoes at the search site may be unrelated to the current investigation, however, the Morcombe family has been advised of this update," a police statement said.

Police and SES workers have been looking for the schoolboy's body at bushland at Beerwah for more than a week.

The search began after Brett Peter Cowan, 41, was arrested and charged with Daniel Morcombe's murder.

Today it was revealed that undercover police spent months in a Perth caravan park surveilling Cowan.

The accused had no idea almost every second of his life was being monitored by detectives who were living just metres from him at Crystal Brook Caravan Park, The Sunday-Mail reported.

The former truck driver and father of three, who often walked around with a parrot on his shoulder, reportedly acted as an unofficial handyman for older residents in the park, before heading to Queensland in early August.

Daniel Morcombe was 13 when he disappeared while waiting for a bus at Woombye in 2003, sparking the largest missing persons case in Queensland's history.