Hundreds of people have gathered to join the search for a missing three-year-old boy as police said they are becoming increasingly concerned.
Mikaeel Kular disappeared from his home in Edinburgh after being put to bed on Wednesday night and has not been seen since.
A major ground, air and sea search has so far failed to find any sign of him.
By 10am, 180 members of the public had registered at the North Neighbourhood Centre in West Pilton Gardens to join the search with hundreds more waiting outside to register.
Police Scotland had earlier appealed for the public for help in finding him.
Volunteers had been asked to gather at the community centre dressed in warm clothes and sturdy footwear.
One of them, Kenny Turner, 55, from Granton, said: "I feel for the family. When you've got kids and grandkids of your own you know what they are going through. I hope he is found and he is safe and well."
Nicola Hunter, 31, from Muirhouse has two sons, aged 11 and five. She said: "I am a mum and I just want to try and help. It's every mum's worst nightmare. It's just too close to home, to think that he was out there last night."
Kimberly MacFadyen, 34, from Davidson's Mains, has a five-year-old boy. "I would be absolutely devastated if it was my wee boy and I would want every person in Edinburgh to stop what they were doing and come to look for him," she said. "Everyone is pulling together it seems. Everyone is talking about it at school and about what they are trying to do."
Work is under way to publish a missing person appeal for Mikaeel on digital billboards across the UK, the charity Missing People confirmed. The adverts are expected to go on display in areas such as train stations, shopping centres, as well as near motorways and at bus shelters.
Earlier, Police Scotland superintendent Liz McAinsh said: "We are obviously deeply concerned that we have had no sightings of Mikaeel.
"All lines of inquiry in the investigation remain open, we are pursuing many lines of inquiry. We still have no evidence of any criminality at this point."
The boy's mother has been named locally as Rosdeep Kular, 33.
Ms McAinsh said: "Mikaeel's mother is getting a lot of support from both the police, her family and her friends, but clearly she is very distraught, she just wants her little boy back home with his brothers and sisters. We are very concerned for her. We just want to be able to give her some news or let her know he is safe and well."
She said that officers have spoken to Mikaeel's father and that all of the boy's family have been very helpful to the police.
Yesterday, police detained a man in the city's Waterfront Gait but said it was unconnected with the boy's disappearance.
The Daily Record reported that the detained man lived at the same address as Rosdeep's first husband b ut the police officer added: "No-one is detained, no-one is a suspect, we have no evidence of any criminality."
Asked whether she thinks the child will be found alive and well, she said: "I remain optimistic but as time passes we become deeply concerned.
"I would stress that this is still a missing person inquiry and we are treating it as such.
"We have no evidence of criminality although all lines of inquiry are being progressed but of course we remain concerned, we just want to find Mikaeel safe and well and that's why we're urging members of the public to assist us."
Hundreds of officers are involved in the search and specialist search teams, mounted officers, dogs, other emergency services and local organisations will also be involved in the investigation today.
Ms McAinsh said more than 150 calls had been made to the helpline which has been set up but there have been no confirmed sightings yet.
CCTV from the scene has been examined but has turned up "nothing significant" so far, she said.
She said she was not aware of any tension in the family that would have caused Mikaeel to run away.
Mikaeel's mother put him to bed at around 9pm on Wednesday only to find his room empty when she checked at about 7.15am yesterday.
The little boy, who has two sisters and two brothers, usually sleeps in the same room as his twin sister but was alone on Wednesday night.
His jacket and shoes were missing and police are looking into whether he might have left of his own accord.
He may also be wearing black gloves with multi-coloured fingers, dark navy blue jogging bottoms, a grey pyjama top with an embroidered turquoise dinosaur on the chest and brown Clarks shoes.
He has a faded scar on the bridge of his nose and a sore on the left hand side of his mouth.
Police have activated the Child Rescue Alert system, which is usually reserved for abduction and kidnap cases and supported by all police forces across the UK.
A special telephone number has been set up for anyone who has seen the child or has information about his whereabouts. Calls to the 0300 200 0200 number will be answered by dedicated members of staff.