Police officers trawling through CCTV footage from across Sheffield on the day of a murder expect to take weeks carrying out the painstaking examination work.
Footage was seized from cameras across Sheffield following the murder of Jarvin Blake on Thursday, March 8 in the hope of identifying those involved in the killing.
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The 22-year-old, from Gleadless, was stabbed at the junction of Catherine Street and Brackley Street, Burngreave, in what detectives are treating as a targeted attack.
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Detectives are using CCTV footage to piece together his movements on the day of the attack and to establish the whether those involved were caught on camera.
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Detective Chief Inspector Steve Handley, who is leading the murder probe, said the CCTV examination work is expected to take weeks.
Jarvin, who three children aged five, three and just seven months old, died from a stab wound to his chest.
A friend he was with at the time - a 23-year-old man - was also stabbed during the attack but survived.
They were attacked after a blue metallic coloured Volvo pulled up on Catherine Street and a number of men jumped out and chased the pair before stabbing them.
The car was last seen heading towards Longley after the attack.
Jarvin was captured on a CCTV camera in a shop in Handsworth a few hours before he was killed.
Detectives released the footage in a bid to jog the memories of those who may have seen him that day.
They have also issued an appeal for motorists who were in the area on the day of the attack to provide their dash cam footage in the hope that the incident, the build up or the aftermath may have been captured.
Four men, aged 24, 25, and two 26-year-olds, were arrested in connection with the murder before being bailed pending further enquiries.
Three of the suspects are from Sheffield and one is from Rotherham.
Anyone with information should call South Yorkshire Police on 01709 443528 or Crimestoppers anonymously on 0800 555 111.