Police say an officer was injured following an arrest at a disturbance in Hill Street in Glasgow city centre on Friday morning.
Eyewitnesses reported a man wearing a balaclava and running back and forth by the private St Aloysius College, the BBC said.
Parents were told to hurry their children into the building and stay inside while police pursued a man.
There were reports the man threatened a lollipop man and tried to attack a janitor at the Glasgow School of Art.
A police spokesman said: "At around 8.30am on Friday, police responded to reports of a disturbance on Hill Street in Glasgow.
"A man has been arrested in connection with the incident and no members of the public are believed to have been injured.
"One officer sustained a minor injury during the arrest. Inquiries are ongoing to determine the circumstances surrounding the incident."
A Glasgow School of Art spokeswoman said: "The Glasgow School of Art can confirm that a member of our staff did encounter the individual described, whilst parking his car near to a GSA building.
"The member of staff is shaken, but unharmed."