Images of a 16-year-old boy in Peterborough city centre on the night he went missing have been released by police.
Theo Kawala was dropped off in the city centre by his father at 1930 GMT on Friday.
He was last seen on CCTV in Lower Bridge Street, heading towards Town Bridge, at about midnight.
The new images show Theo on Westgate shortly before midnight and a few minutes later on Bourges Boulevard.
Theo had walked along Broadway and then Westgate, before walking through the bus station and along Bourges Boulevard.
He then crossed Bourges Boulevard at the pelican crossing near the old Woolworths building and walked into Lower Bridge Street.
Officers hope the images, which track his progress across the city centre, will jog people's memories.
Theo, who is slim and 6ft 1in (1.85m), was wearing blue jeans, a black shiny jacket, red and white check shirt and black trainers.
Insp Mat Newman said: "We know there were people around at the time so anyone who was in the city centre that night should consider whether they saw Theo.
"The information they provide could be vital to this inquiry."
On Wednesday, Theo's family said they were "devastated, anxious and very concerned" about his disappearance.
- 23 February 2011