Four armed men dressed in Halloween costumes and masks pretended they were trick or treating before barging into a Sydney home, tying up a family and robbing them in a terrifying home invasion.

The men, who were armed with a gun and a metal pole, knocked on the door of the Belmore home in the city’s west about 10pm on Tuesday.

Two grandparents and two sisters, aged 15 and 18, were tied up with television cables before the gang ransacked the home looking for drugs and money, before realising they had the wrong home, News Ltd reported on Wednesday.

The thieves stole property and escaped before the family released themselves and called authorities, police said.

Helen Nguyen, the girls’ older 23-year-old sister said the group first yelled “trick or treat” but were told to leave.

They returned 30 minutes later and barged in when one of the teens answered the door.

The family members were was able to untie themselves after the intruders left and call police.

Due to the masks they were unable to give an accurate description of the robbers.

A crime scene has been established and police investigations are continuing.

A neighbour who lives across the road told the Seven Network he saw one of the masked men fleeing in a car.

“It’s a very quiet street, so this is really surprising that something like this would happen,” Daniel Andreini said on Wednesday.

“My heart goes out to the family, it is disappointing to see something like this occur.”

On Queensland’s Sunshine Coast, meanwhile, trick-or-treaters were shot at with paint pellets by teenagers leaning out of a ute.

Teenage boys, both 15, were hit in the face by the pellets.

One of the boys was taken to Sunshine Coast University Hospital with an eye injury after the incident at Pelican Waters after 7pm on Tuesday.

Two males, aged 18 and 17, are assisting police with their inquiries after Halloween costumes and pellet ammunition was found in their ute when stopped by police.