Joanna Yeates: search for answers continues

17 December: CCTV image of Joanna Yeates buying a pizza in a Tesco Express on the night she was last seen. The footage shows the 25-year-old buying a Tesco Finest tomato, mozzarella and basil pesto pizza at around 8.40pm in Clifton Village, Bristol. She is seen using a self-service till in the supermarket and is wearing a cream-coloured coat with a rucksack on her back Photograph: Avon and Somerset Police/PA 17 December: CCTV image of Joanna Yeates at Waitrose at Clifton Triangle in Bristol at around 8pm Photograph: Avon and Somerset Police/PA 17 December: CCTV footage issued by Avon and Somerset police of Joanna Yeates seen in Bargain Booze on Regent Street, Bristol, on the night of her disappearance Photograph: Avon and Somerset Police/PA 23 December: Police outside the ground floor flat in Clifton, Bristol, where Joanna Yeates and her boyfriend Gregory Reardon lived Photograph: Ben Birchall/PA 23 December: Joanna Yeates's parents David and Theresa hold a picture of their daughter at a press conference to appeal for information Photograph: Barbara Evripidou/Bristol News and Media/PA 23 December: Avon and Somerset search and rescue crews scour the woods around Clifton Downs, Bristol, for Joanna Yeates Photograph: Ben Birchall/PA 25 December: Police and forensic teams conduct examinations on Longwood Lane, near Failand, north Somerset, where a body was found. The discovery was made by a couple walking their dogs Photograph: Ben Birchall/PA 26 December: A floral tribute lies next to the Longwood Lane sign near where a body was found on Christmas Day Photograph: Christopher Furlong/Getty Images 26 December: Police continue their forensic search near Longwood Lane, Bristol, where a body was found on Christmas Day and believed to be that of missing landscape architect Joanna Yeates Photograph: Christopher Furlong/Getty Images 27 December: The day after police confirmed the body found at Longwood Lane to be that of Joanna Yeates, her parents David and Theresa lay flowers at the spot, about three miles from where she lived in Clifton Photograph: Ben Birchall/PA 28 December: Police continue to guard the scene where Joanna Yeates's body was found on Longwood Lane. The postmortem revealed that the landscape architect had been strangled. Avon and Somerset police revealed that she had died as a result of 'compression of the neck' and their inquiry officially became a murder hunt Photograph: Ben Birchall/PA 29 December: Forensic officers walk outside Joanna Yeates's flat in Clifton, Bristol. Detectives are investigating a report that she was seen leaving her flat with two people on the night she disappeared Photograph: Tim Ireland/PA