A teenager who died of "serious injuries" in the early hours of Saturday morning may have been assaulted, police say.
An 18-year-old man was found at 2.18am on Saturday in Sackville Street, Portsmouth, with "significant injuries" and was taken to hospital where he later died.
Officers are investigating whether the teenager was assaulted earlier in the evening.
A Hampshire police spokesman said: "We're investigating the circumstances of his death and are carrying out activity in other areas of Portsmouth as we believe the man may have been assaulted earlier in the evening.
"We are currently carrying out enquiries on roads including: Liverpool Road, Manchester Road, Guildford Road, and Sandringham Road.
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"We would like to hear from anyone who was in the area at the time and may have witnessed anything suspicious."
:: Anyone with information should contact Hampshire Police on 101 and quote reference '44180054258' or call Crimestoppers anonymously.