Officers were called by the ambulance service at approximately 4.38am this morning (Wednesday, July 31) to reports that a man had been assaulted on Call Lane.
The victim, 39-year old-man, has been taken to hospital with serious injuries.
A force spokesperson has confirmed that a 19-year-old man has been arrested on suspicion of assault and remains in police custody at this time.
Yorkshire Evening Post photographer Jonathan Gawthorpe captured these shots from the scene...
1. Call Lane incident
Police incident off Call Lane, near The Bridge Bar. | Jonathan Gawthorpe
2. Call Lane incident
Officers were called by the ambulance service at approximately 4.38am this morning (Wednesday, July 31). | National World
3. Call Lane incident
A forensic scene has been put in place near to The Bridge Bar on the corner of Call Lane and Bridge End. | National World
4. Call Lane incident
Police forensics were photographed hard at work. | Jonathan Gawthorpe
5. Call Lane incident
Detectives from Leeds CID were pictured at the scene. | National World
6. Call Lane incident
Police responded to reports that a man had been assaulted on Call Lane. | Jonathan Gawthorpe