Police Scotland is investigating following an offensive social media comment made in relation to the Mikaeel Kular missing person enquiry.
The remark, which was made on Twitter, originated from the Greater Manchester area and was brought to police attention by an Edinburgh resident.
Officers are now liaising with colleagues from Greater Manchester Police to identify the individual responsible.
A Police Scotland spokesman said: "Any reports of racist, offensive or abusive comments made online will be thoroughly investigated and those responsible will be brought to justice.
"If you commit an offence, we will investigate it and you will be prosecuted.
"Anyone who wishes to report offensive communications online can call 101 or contact their local policing team."