Police are investigating a possible murder-suicide after the bodies of a woman and a man were found inside a unit in Newtown.

The bodies of the woman, aged in her 20s, and the man in his 30s, were discovered inside the unit on King Street by police at about 5:30pm on Friday.

The residential unit above a Persian restaurant where the bodies are believed to have been found. Credit:James Alcock

Police attended the unit after an individual who knew the pair raised concerns for their welfare. It is understood the man and woman knew each other.

Marrickville Local Area Command Inspector Geoff Olsen said investigators suspected the deaths were a murder-suicide. But he stressed they were investigating other possible scenarios.