Police in Scotland are fully exploring whether a three-year-old boy went missing from his home after a criminal act.

It remains possible that Mikaeel Kular left his family’s flat in Edinburgh of his own accord after being put to bed on Wednesday night, Assistant Chief Constable Malcolm Graham, of Police Scotland, said.

“It is, however, entirely possible that Mikaeel has become subject of a criminal act and our investigation has been established as a twin track to ensure that eventuality is being, and will be, fully explored,” he said.

Graham gave the update at the end of a day when hundreds of volunteers helped search the area for any sign of the boy.

“It is of grave concern that Mikaeel has been missing for nearly 48 hours,” he said.

“Since he was last seen on Wednesday night by his mum, and all of the work we’ve been doing, we’ve been unable to confirm any sightings of Mikaeel.

“As a result, our operations and our investigations are continuing in tandem but we must make sure we examine fully every possibility as to what might have happened.”

Police had already announced that officers are investigating a “potential sighting’’ of a child matching Mikaeel’s description and wearing a cap.

Members of the public reported seeing a boy who was “small in build and alone’’ in West Pilton Gardens, Edinburgh, at around 8.30am on Thursday. However, police said Mikaeel does not usually like wearing something on his head and the child’s identity could not be confirmed.

All immediate family members have been traced and spoken to by police

Specialist teams have been deployed from across the country to help search, investigation and community support work, Graham said.

Superintendent Liz McAinsh aid there had been a “positive response” to the appeal for information in relation to the potential sighting. She said Mikaeel has not been at nursery since the Christmas break because he has been ill.

All immediate family members have been traced and spoken to by police.

“It has been extremely helpful to understand all the circumstances that have led up to his disappearance,” Graham said.

He added: “We have established a timeline of Mikaeel’s movements going back for sometime prior to when we can establish that he was last seen in the house on Wednesday night.”

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