Police have until 5pm to continue questioning their main suspect over the disappearance of April Jones.
Mark Bridger is under arrest for the abduction and suspected murder of the five-year-old, who disappeared while out playing with friends near her home in Machynlleth in Mid Wales five days ago.
Police initially arrested Bridger on Tuesday afternoon on suspicion of abduction.
Detective Superintendent Reg Bevan from Dyfed-Powys Police confirmed on Friday that the 46-year-old had been re-arrested on suspicion of murder.
Police will soon have been questioning him for 96 hours - after which they must either charge or release him.
They are due to hold a news conference at any time between 3pm and 5pm.
Friends of April have told police they saw her get into a vehicle at around 7.30pm on Monday.
She has not been seen since despite a search that has been described by police as "unprecedented" in scale.
The rescue effort has been coordinated at the leisure centre in the town.
Teams of experts including mountain rescuers, coast guards and police with sniffer dogs worked through the night again as the search for the missing youngster entered its fifth day.
Mick Nield, from Oldham Mountain Rescue, works with specially trained dogs.
He told Sky News: "The dogs work on air scent, which pick up any human scent, so if there's any human scent in the area they'll pick it up."
He confirmed his team arrived on Thursday, but extra teams were called in from Manchester last night.
Local people are determined not to give up hope of finding April safe and well.
Superintendent Ian John told Sky News: "The search effort is building, not shrinking. We now have 10 police search teams on the ground and a large number of mountain rescue and other services as well as an increasing amount of specialist search equipment."