Six people have been charged with murder following an investigation into the disappearance of Cory Breton and Iuliana Triscaru in Logan, south of Brisbane.

Key points: Murder charges against six people follow investigation into disappearance of three people in late January

Murder charges against six people follow investigation into disappearance of three people in late January Two are still missing but a third person, Lelan Harrington, 23, reappeared and has been helping police

A 24-year-old Logan Central man, a 36-year-old Crestmead woman, a 31-year-old Crestmead man, a 21-year-old Kingston man, a 22-year-old man of no fixed address and a 21-year-old Slacks Creek man have all been charged with two counts of murder.

The Slacks Creek man has also been charged with one count of possessing a dangerous drug.

Two men were arrested after police intercepted a vehicle on the Gateway Motorway at Belmont on Brisbane's east side just before 5:00pm on Wednesday.

Police allegedly located a quantity of methylamphetamine during a search of the vehicle.

A search by specialist police will continue today at a location off Mudgee Street at Kingston.

They are all expected to appear before Brisbane Magistrates Court today.

Mr Breton and Ms Triscaru were reported missing in late January, along with 23-year-old Lelan Harrington.

Mr Harrington was found at a Logan address on Tuesday, and Detective Superintendent Dave Hutchinson said on Wednesday he was not a suspect and had helped police with their inquiries.