Police investigating a sex attack on an 18-year-old who later fell to her death from a motorway bridge have released pictures of two possible key witnesses.
Sara Clark, from Hampshire, had reported to police that she was sexually assaulted on 30 May.
Her family believe a delay in a police follow-up call over the allegation led her to jump from a bridge on 2 June.
Officers have released CCTV pictures of two men seen with Miss Clark before the alleged assault in Totton.
They said the men were "two key and potentially significant witnesses" and appealed for them to contact Hampshire Constabulary.
The first man was seen walking with Miss Clark to Southampton Central station before leaving her when she caught a Wilts and Dorset bus.
The second man was also seen at the railway station and boarded the same bus as Miss Clark.
He also left the bus at the same place, outside the ASDA superstore in Totton, and could be the last person to see her before the assault.
Miss Clark's body was discovered by a lorry driver in the early hours of Saturday, 2 June, on the westbound carriageway of the M27 near Southampton.
Her family have said she was depressed because she feared no-one believed her about the assault.
The case is being dealt with by the Independent Police Complaints Commission.
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