Detectives investigating the murder of a schoolgirl in a woodland said they were looking at the possibility that she was killed by children.
Lauren's body was found by her grandfather
Lauren Pilkington-Smith, 10, was found near her home on Twist Lane in Leigh, Greater Manchester, on Friday morning.
She died as a result of multiple blows to the head.
Greater Manchester Police said on Monday that officers were keen to speak to two boys who may have been the last people to see Lauren.
A spokeswoman said: "These two boys are integral to the inquiry.
"At this stage we are looking at a number of lines of inquiry - one of these being that children were involved, but we just don't know."
Police are examining CCTV footage of the area
The pair were seen playing with Lauren on Sanderson Street at about 2020 BST on Thursday. One was aged between nine and 11, and the other was slightly bigger and older, aged between 14 and 15.
Lauren's body was found in a wooded area by Sanderson Street, 200 yards (183m) from her home and close to the banks of the Bridgewater Canal.
Officers also want to question a 44-year-old man who has been charged with attempted murder and serious sexual assault in north Wales.
A post-mortem examination revealed that Lauren died as a result of multiple blows to the head.
Police have said she was not sexually assaulted.
Lauren's family became concerned on Thursday evening when she did not return home. Her body was found by her grandfather early on Friday morning.
Her mother, Alison Pilkington-Smith, and father, Glen Smith, have paid tribute to their "beautiful, lovely little girl".
"Our world has collapsed and we can't even begin to think what we will do without her," they said.
Police are examining CCTV footage and want to speak to anyone who was in the Sanderson Street area after 2000 BST on Thursday.