Edinburgh police swooped on North Bridge in a major response to an early morning incident.
Several police attended the scene at 3.30am on Tuesday morning that involved a crowd of people and officers standing over an individual on the ground.
One eyewitness told Edinburgh Live that two people - a man and a woman - had been attacked.
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In a video clip seen by Edinburgh Live one person is on the pavement with police surrounding them, while several people crowd around.
A number of officers are at the scene and blue lights can be seen reflecting on the side of the bridge.
One eye witness said: "It looked like one guy was attacked as well a woman."
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Police Scotland have been contacted for comment.
We'll bring you more on this news story as details emerge. In the meantime, you can follow us on Facebook, Instagram and Twitter.
