A young woman was killed - after an alleged arson attack in Australia - was seemingly directed towards the wrong home

A homicide investigation's been launched -- and Police allege criminals firebombed the wrong home.

A 27 year old woman, house-sitting for her brother on his honeymoon, was killed after arsonists allegedly set a home ablaze in Melbourne's Truga-nina - trapping the victim inside the house.

Witnesses have described the scenes to Seven News Australia.

One says the flames were bad, and another says they're feeling upset and unsafe.