Detectives investigating the disappearance and alleged murder of a Glen Innes businessman two months ago have arrested five people following a number of raids this morning at Casino and Grafton.

Three men, aged 25, 29 and 36, and two women, both aged 32, were arrested just after 6am when police executed a number of warrants at homes in Casino and South Grafton.

The five people have been taken to Casino and Grafton Police Stations where they are assisting with inquiries.

On October 28 last year Adrian Trevett (pictured), 62, was driven to Jackadgery, 45km west of Grafton, by a female friend and spent a night at a Mann River caravan park before riding his bike to the summit of the Gibraltar Range.

Police allege the following afternoon, on October 29, Mr Trevett was picked up by his female friend at Rangers Hut, Gwydir Highway, at Glen Innes.

His family raised the alarm when he failed to return home.

Last November New England LAC detectives established Strike Force Vallen to investigate Mr Trevett’s suspicious disappearance.

Last week detectives travelled to Brisbane where they arrested a 46-year-old woman who was extradited to NSW.

She was charged with Mr Trevett’s murder and appeared before Armidale Local Court last Saturday where she did not apply for bail. She has been remanded in custody to reappear before Armidale Local Court on January 10.

Four days ago, officers led by Strike Force Vallen detectives, located a decomposed body in a ravine at Sandy Hill in the Girard State Forest, 30km east of Tenterfield.

The body is believed to be that of Mr Trevett, however, police are still awaiting the results of forensic analysis to make a formal identification.

Early this morning Strike Force officers raided three homes in Casino, arresting the 25 and 29-year-old men and two women both aged 32 years.

The 36-year-old man was arrested at a unit in South Grafton.

New England LAC Crime Manager Detective Inspector Greig Stier said the arrests follow an exhaustive investigation into Mr Trevett’s disappearance.

“We have conducted extensive inquiries into this matter and the complexities surrounding this investigation required us to work closely with other jurisdictions,” Det Insp Stier said.

“Today’s arrests are an outstanding result, however, investigations are continuing.”

Anyone with any information is urged to contact Strike Force Vallen detectives via Crime Stoppers on 1800 333 000.