Police have dropped charges against a 28-year-man over the deaths of a couple whose bodies were found in their burnt-out home in Ipswich, west of Brisbane, last week.
Just four hours after announcing the man had been charged with murder and arson, police issued a new statement saying proceedings had been "discontinued" and the man had been freed from custody.
The statement said police had received new information and the investigation is continuing.
The bodies of Christine and Joe Stephan, aged 68 and 73, were discovered after fire engulfed their Collingwood Park home on January 23.
Police initially said they believed there was no third-party involvement but post-mortem results later revealed the deaths were not caused by the blaze.
Firefighters had to force entry to the house to extinguish the blaze that had taken hold on the lower level of the residence.
The couple's bodies were found a short time later and a crime scene was declared.
Police have released photos of a black Mercedes and a green ute which they believe could be "an important piece of the puzzle."
Detective Inspector Heath McQueen appealed for anyone who may have information in relation to the homicide investigation to come forward.
"I am specifically appealing to anyone who may have dashcam footage and who were in the vicinity of Kruger Shopping Village Redbank Plains, Kruger Parade, Burrell Street and Hannant Street at Collingwood Park between 8am and 11am on Saturday, January 22," Detective Inspector McQueen said.
"We are also interested in the movements of a black Mercedes Benz and green utility between those times.
Detective Inspector McQueen said the couple had two children and police were working with the family to provide support.
"As you can imagine, they're very traumatised in relation to what's occurred," Detective Inspector McQueen said.
'We're currently working with the family to provide them the welfare and support necessary."
Detective Inspector McQueen said investigators thought there were "further persons with information that could help the rest of this investigation".
"I'd like to call on any persons with information to please contact Crimestoppers on 1800 333 000," he said.
