A man has suffered an injury to his arm following an altercation at Petersham overnight, NSW Police say.
About 11.20pm tomorrow, an altercation occurred between two men outside a hotel on Livingstone Road.
As a result, one of the men, aged 20, suffered a laceration to his arm. He was taken to Royal Prince Alfred Hospital for further treatment.
The other man was seen running from the area along Livingstone Road.
Police established a crime scene and a full investigation is now underway.
Anyone who may have information regarding the incident is asked to contact officers at Marrickville Police Station (02) 9568 9299.
Police are urging anyone with information in relation to this incident to call Crime Stoppers.