Thames Valley Police has paid tribute to the four men who lost their lives.
Today marks the fifth anniversary of the partial collapse of the boiler house at Didcot Power Station.
Four men, who were preparing the site for demolition, were killed in February 2016 when part of the structure came down on top of them.
Thames Valley Police's joint investigation with the Health and Safety Executive continues to look at corporate manslaughter, gross negligence manslaughter and Health and Safety offences.
Deputy Chief Constable Jason Hogg, said: "Our thoughts as always remain with the family and friends of Michael Collings, Ken Cresswell, Christopher Huxtable and John Shaw, who lost their lives following the partial collapse at the Didcot A Power Station.
"Five years have passed since the incident which claimed these men's lives.
"As from day one we continue to investigate with the same focus, dedication, and a commitment to find out what led to the deaths of the four men and obtain answers for their families."
Jason Hogg also said the force had maintained close contact with the families throughout, 'providing them with regular updates on the status of the investigation.'
He added: "We also maintain contact with the Crown Prosecution Service, to provide them with updates on the case.
"I would like to pay tribute to the men who lost their lives as well as their families for showing such resolve over the years that have passed. We remain unfaltering in our duty to fully investigate the collapse at Didcot."
In a previous update in February 2020, Thames Valley Police revealed that it had been looking over 'vast amounts' of evidence data including 2,326 witness statements, over 150,000 pieces of digital evidence, and over 4,500 physical exhibits.
Didcot A, a coal-fired station, was in service for 43 years and was switched off in 2013
The remaining section of the boiler house was demolished in July 2016, 5 months after the fatal collapse.