UPDATE: Four men have been arrested following the alleged fire-bombing a house in Maryborough on Monday morning.
Police said four men allegedly threw glass bottles filled with petrol at the house causing minor fire damage to the front veranda and fence.
Police allege the men returned a short time later, entered the house through a window, threatened the sole male occupant with a knife and smashed a number of windows.
It is further alleged the men left before returning once again, allegedly setting fire to a mattress which engulfed the house in flames.
Two 24-year-old men and a 23-year-old man from Maryborough and a 21-year-old man from Hervey Bay were charged with one count each of threatening violence, unlawful deposition of an explosive, wilful damage and burglary.
The 21-year-old was further charged with two additional counts of arson and three counts of wilful damage.
The men were due to appear before the Maryborough Magistrates Court on Tuesday.
EARLIER: A family of five was lucky to escape a fire which spread from a neighbouring house in Churchill St in the early hours of Monday.
"My daughter heard the windows exploding and woke us all up," Melanie Penny said.
"If it wasn't for her ... well, there's nothing left of my son's bed."
Firefighters were able to extinguish the fire before it spread much further than the family's sleep-out, but the ceiling was extensively damaged and deemed unsound.
Maryborough Fire Station's Dennis Pamenter said the Criminal Investigation Branch was looking into the blaze which gutted the house next-door.
It started about 2.10am and was being regarded as suspicious.
Mr Parmenter said several young men rented the house and luckily no one was home at the time except the pet dog, which managed to escape unharmed.