Petrol bomb thrown at Melbourne apartment

A petrol bomb has been thrown at a Melbourne apartment, setting its front door alight.

There were two people inside the apartment when the attack occurred in the early hours of Saturday morning.

"Police are investigating the circumstances surrounding a fire in a residential premises in Port Melbourne this morning," a Victoria Police spokesperson said.

"It is believed the front door of the Esplanade East apartment was deliberately lit, causing moderate damage, about 1.30am."

Those inside the apartment managed to douse the fire before fire fighters could arrive.