Three police officers remain in hospital after an explosion in Melbourne's south on Saturday night.
Two female officers are in a critical but stable condition and a male officer serious but stable after being injured in the blast.
Two Metropolitan Fire Brigade firefighters were also injured at the Middle Park residence.
A Victoria Police spokeswoman told Fairfax Media that emergency services were responding to report of man threatening suicide at an apartment on Hambleton Street at 9.15pm.
The firefighters entered the second-storey flat, followed by the police officers. A large explosion then occurred.
The police officers were taken to The Alfred hospital and the firefighters were taken to the Royal Melbourne. The man threatening suicide was also injured.