More than 1,000 taxi drivers have been asked if they have seen a 23-year-old who has been missing since March.
Jack O’Sullivan was last seen in the Brunel Lock Road / Brunel Way area of Bristol at around 3.15am on Saturday 2 March.
Police previously said Mr O’Sullivan, described as 5ft 10 and wearing a quilted green/brown Barbour jacket at the time, had been on a night out with friends when he went missing.
They have now urged taxi drivers who were working on the night in the Cumberland Basin network to report if they have dashcam footage or eyewitness accounts of the missing man.
Avon and Somerset Police have also asked a dogwalker – seen in the area early the same morning – to come forward as they could be a possible witness.
Senior investigating officer DI Jason Chidgey said he hopes the appeal will “yield more potential footage which can help us provide answers to Jack’s family about what happened to him”.
He added: “We know there were a significant number of vehicles in the area during this time and we’ve previously appealed for anyone with dashcam footage to come forward – with a particular focus on the area of Brunel Way, Brunel Lock Road, Junction Swing Bridge, Plimsoll Swing Bridge or the Portway, anytime between 2.45am and 4am on Saturday 2 March.
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“We’re also still appealing for any mobile phone or doorbell footage. Our thoughts are very much with Jack’s family who are going through an unimaginable ordeal, and we’re committed to supporting them in any way we can.”
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Jack’s mum Catherine, originally from Neath in Wales, said “we really need to find him” last month.