A young thug threatened staff at the Examiner with a knife.
The yob, accompanied by two others, pulled a knife on one of the customer receptionists yesterday afternoon.
Two other staff members were subjected to a tirade of abuse by the three yobs, who were captured on film at the Queen Street South offices shortly after 1pm.
Police are appealing for any witnesses to the incident to contact them on 0845 6060606.
The yobs, thought to be aged between nine and 11, were asked to leave the offices, but hurled stones at glass doors.
Staff went to remonstrate with the yobs, one of whom threatened the employee, saying: "I'm going to slash your face."
The youths then ran off into Queen Street South.