Tests on human remains found following an explosion at a three-storey block of flats have proved "inconclusive".
The remains were believed to be those of Guido Schuette, who went missing after the 14 February blast in the Osney Lane area of Oxford.
But police said further tests to identify them and ascertain the cause of death were required.
Three flats were destroyed in the blast and a further five may have to be demolished.
As a result of the post-mortem, conducted on Sunday, Thames Valley Police are still treating Mr Schuette as a missing person.
The 48-year-old's family have been informed.
Following the explosion, the cause of which is unknown, 40 firefighters worked to tackle flames and rescue people trapped in adjacent buildings.
A2Dominion, which operates the block of flats, said 13 households remain in temporary accommodation.
A2Dominion housing director Dawn Wightman said: "We have been contacting residents on a regular basis and have now set up a temporary office on-site to help us provide ongoing support to everyone affected."
A police cordon remains at the scene.