What we know so farpublished at 14:13 BST
Noah's disappearance
Three-year-old Noah Woods was at a playground in Brantham, Suffolk, with a relative on Tuesday, but the pair "became separated" when they left at about 15:00 BST.
It is reported that Noah ran off down an alleyway towards a housing estate.
The three-year-old is non-verbal, has partial hearing loss and is undergoing an autism assessment. He is wearing a white Bluey T-shirt, shorts and black Vans trainers with a white stripe.
Suffolk Police says Noah would not respond to his name being called.
The search efforts
Police officers have been searching overnight, extending the search area into the nearby villages of Manningtree, Essex, and East Bergholt, Suffolk.
The force has deployed dog units, specially trained officers and its search efforts have been joined by HM Coastguard, the fire service and local search and rescue teams.
Hundreds of people have arrived at Brantham Village Hall to help efforts. Police have asked them to avoid open waters and railways in their searches as these areas require "special expertise".
"I just saw the news and needed to come down and help," Melissa Dark, a local mother-of-two, told the BBC.
CCTV release
This afternoon, Suffolk Police released CCTV of the last confirmed sighting of Noah in the park in Brantham at 14:37 BST on Tuesday.
The video shows the three-year-old spinning and running around a roundabout.
Latest from the police
Supt Tom Pearse of Suffolk Police said there was "nothing to indicate anything sinister" or any elements of criminality have taken place and the disappearance was still being treated as a missing persons investigation.
He asked the public to check gardens, sheds and outbuildings, while asking drivers to review dashcam footage and residents to review CCTV from 14:37 BST on Tuesday onward.
People with information can call a dedicated police phone line on 0800 0516076.


















