A man fled the scene after two other men were found with injuries in York city centre, police said.
Officers swooped on the Marygate area at about 12.45pm today (Friday, August 9) after reports of an assault there.
Two men were found injured and one of them has been taken to hospital for treatment, North Yorkshire Police said.
The force added that its investigation into the incident is ongoing.
A police spokesperson urged anyone with information to come forward by calling 101 or Crimestoppers anonymously on 0800 555 11, quoting reference number 12240143474.
As The Press reported earlier, a police cordon was in place in Dame Judi Dench Walk with officers on the scene.
An unmarked police car was outside Museum Gardens, at the Museum Street entrance, at 1.30pm and had left by 1.50pm.
Witnesses on the scene said a police car and ambulance left the scene at about 1.20pm.
Another witness said he saw a police car leaving the Marygate car park with its sirens on shortly before 1.50pm.
Members of the public could still pass the section of Dame Judi Dench Walk that was sealed off - either by using the walkway closer to the Ouse or by doubling back and going through Museum Gardens.
Two police officers were at the cordon, standing at either side of the tower at the bottom of Marygate.
A mountain bike was seen lying on its side on the ground near the tower inside the cordon.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules hereComments are closed on this article