Detectives investigating the disappearance of Hull student Libby Squire want to trace four people who may have vital information for their inquiry.
They have released CCTV footage which shows the people on Oak Road, close to the junction with Clough Road between 1am and 2.30am on the day Libby was last seen.
The 21 year old went missing shortly after midnight on February 1, 2019 and police searches have subsequently focused on the Oak Road playing fields.
The first clip shows someone wearing a light coloured T shirt and dark trousers, at first running into view on Oak Road and then walking out of shot at 1.13am.
The second clip shows a figure riding a bike along Oak Road towards Clough Road at 1.24am, and is then seen cycling back up Oak Road at 1.34am.
The third clip shows two people, one who appears to be dressed all in dark clothing and the second in light coloured trousers and a dark coloured top walking along Oak Road at 2.34am.
Detective Superintendent Smalley added that Libby remained a 'priority' and that searches were still taking place in and around Oak Road with further work continuing in connection to CCTV and witnesses.