At about 5.30pm on Sunday, December 15, an unknown male approached a 17-year-old girl at a shopping centre in Liverpool.

The male allegedly followed the girl to the car, and was reluctantly let inside.

He allegedly began sexually assaulting her.

A short time later, the male asked the girl to drive him to Wheat Park in Sadlier, to which the girl agreed on the understanding he would then leave, police said.

However, at the park, two other males got into the car and also allegedly sexually assaulted the girl.

A fourth male arrived in another vehicle, and the alleged assault continued as the girl was driven around.

At about 11.30pm, when the males left the girl in her car, she contacted a friend who took her to the police to report the incident.

At about 7.20am on Friday, December 20, detectives arrested a 16-year-old boy at a home in Condell Park.

He was charged with 24 offences including multiple counts of sexual assault without consent and of aggravated sexual assault.

Just after 7.35am that same day, detectives arrested a 14-year-old boy at a home in Miller.

He was charged with multiple offences including seven counts of aggravated sexual assault in a group.

Both were refused bail and appeared in a children’s court on Saturday, December 21.

Following further inquiries, at about 6am yesterday, police carried out simultaneous search warrants in Sadlier and Heckenberg.

In Sadlier, police arrested an 18-year-old man.

He was charged with nine counts of aggravated sex assault in company.

He was refused bail to appear in a children’s court today.

In Heckenberg, police arrested a 19-year-old man and charged him with five counts of aggravated sex assault in company.

He was refused bail and will appear in court today.