A youth was attacked at Gaddigodam area in the city last night following a quarrel between two groups. The victim Shushant Khobgrade was waiting for his friends at Gaddigodam square last night when he saw a few youth fighting over some issue. He intervened and tried to stop the quarrel. However, the accused got irked with his interference and attacked him with knife. Sushant was immediately taken to a hospital. Panchpaoli police have registered offence against the unidentified attackers. Further investigation is going on.