Two men have been stabbed in a mass brawl involving up to 15 people.
The fight happened in Connaught Road, Reading, just before 20:00 GMT on Tuesday.
One man, aged in his 30s, was taken to hospital with serious injuries which are not thought to be life-threatening, Thames Valley Police said.
A second man, also in his 30s, was taken to hospital with minor injuries. No arrests have been made, the force added.
Police said three people, all believed to be men, were seen running from the scene off Oxford Road towards Prince of Wales Avenue.
Det Insp Marc Skinner said: "One of the men seen running away was possibly injured.
"We would like this person, or anyone who knows this person, to come forward so that we can ensure they are safe and well."