Thames Valley Police is currently investigating an unexplained death after a fire on Saturday.
Officers were called by the fire service to a fire at a commercial garage in Church Street, Bletchley at 5.11am.
A man was rescued from the building, however he later died at the scene.
The road closures, set up on Church Street as police and fire service continued their investigation, were lifted later the same day.
Crews from Bletchley, Great Holm and Broughton were called to the fire in a commercial garage in Church Street shortly before 5am after it was spotted by a neighbour.
Firefighters wearing breathing apparatus found the man inside the ground-floor workshop area and carried him outside.
Firefighters and paramedics tried to resuscitate the man, but he was pronounced dead at the scene.
Group Manager Greg Smith from Buckinghamshire Fire & Rescue Service said: “Our thoughts are with the man’s family and friends and the local community.
“Firefighters will be visiting the area today to provide reassurance and offer fire safety advice to local residents.”
Anyone who may have seen anything in and around Church Street in the early hours of this morning or who has any information about this incident is asked to contact Thames Valley Police via the non-emergency number 101 quoting reference 354 01/09/12.
If you don’t want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.