An investigation into the collapse by Thames Valley Police with the Health and Safety Executive is no further on.
Thames Valley Police said the investigation team, which was put in place immediately after the collapse at Didcot, continues to investigate offences of corporate manslaughter, gross negligence manslaughter and health and safety offences.
Ben Snuggs, Deputy Chief Constable of Thames Valley Police, said: “As always our thoughts remain with the families of Michael Collings, Ken Cresswell, Christopher Huxtable, and John Shaw following the loss of their loved ones.
“Thames Valley Police, together with the Health and Safety Executive, remains totally committed to rigorously investigating the collapse, and I am very conscious of the time it is taking to investigate those circumstances.
“We maintain regular contact with the families, and continue to provide updates and support through our dedicated family liaison officers and investigation team.
“This investigation is significant and complex with vast amounts of witness, digital and physical evidence, and we continue to make good progress with further suspect and key witness interviews.
“We are also in close liaison with the Crown Prosecution Service, and continue to provide appropriate updates to key stakeholders and interested parties.
“It is our responsibility and duty to investigate thoroughly, following all reasonable lines of enquiry and we will do everything we can to provide answers to the families.”