A Brighton teenager was stabbed in the buttocks in London Road on Friday evening.
The attack happened shortly after 8pm, close to the junction with York Hill.
The 17-year-old victim, a local boy, was taken to Royal Sussex County Hospital in Brighton with wounds to the buttocks.
Officers attended the scene however there was no trace of any suspects. An area by the Co-Op supermarket and the funeral parlour further south were also cordoned off for a period.
Anyone with any information is asked to report it online at https://sussex.police.uk/appealresponse or call 101 quoting serial 1334 of 06/10.
Alternatively, you can visit the Crimestoppers www.crimestoppers-uk.org website or contact the independent charity anonymously on 0800 555 111.