Detectives are appealing to the public as investigations continue into online child-grooming activities.
Police from Richmond Local Area Command formed Strike Force Earthworm in June 2012 to investigate a recent series of sexual assault offences.
As part of ongoing investigations, officers became aware of alleged online child-grooming activity on social-networking sites.
In September, strike force investigators executed a search warrant at a house in Goonellabah and arrested a 40-year-old Goonellabah man.
He was later charged with 53 offences, including sexual intercourse with a child between 14 and 16 years, aggravated sexual assault in company, possess child pornography and aggravated indecent assault.
He was refused bail and is due to appear at Lismore Local Court on Tuesday 20 November 2012.
Following further inquiries, investigators executed a search warrant at a rural property near Alstonville.
A 44-year-old man was arrested and charged with two counts of aggravated sexual assault in company and aggravated indecent assault.
He was granted conditional bail and is due to appear at Lismore Local Court on the same day.
The investigation is ongoing and further charges are expected to be laid in the future.
Strike force investigators are urging anyone with information that may assist with their investigation to contact Lismore Detectives or Crime Stoppers on 1800 333 000.
Meanwhile, police urge parents and children to be mindful of the dangers associated with online grooming.