Mystery surrounds the deaths of a man and woman whose bodies were found in Melbourne home.

Police were conducting a welfare check at the property in Werribee, in the city’s south-west, when they made the grim discovery.

Neighbours were shocked when multiple police cars turned up.

Police are investigating the death of the pair.Police are investigating the death of the pair. (Nine)

The 31-year-old man and 29-year-old woman, believed to be partners, were found dead by officers late yesterday.

The alarm was raised by loved ones who hadn’t heard from the pair since Tuesday.

A number of police evidence markers were seen scattered across the backyard of the home, which is listed for sale.

The results of a postmortem will be key to piecing together what happened.

Police say they are not looking for anyone else in relation to the deaths