The desperate search for a teenage girl has take a grim turn as the case enters its ninth day. 17-year-old girl Pheobe Bishop was last seen leaving her home in Gin Gin, in Queensland, on May 15 as she vanished without a trace.

Pheobe, who had been living with couple Tanika Bromley and James Wood, and cops believe the teen was supposed to have boarded a 8.30am flight to Brisbane then onto Perth to meet up with her boyfriend. Detectives have suggested the pair drove Pheobe for 40 minutes to Bundaberg Airport but new footage has emerged in her case.

The teenager was dropped off at the airport but she never never checked into her scheduled flight. The couple were taken in for questioning by cops but they were released and no charges have been filed against them and there is no suggestion they were involved in her disappearance.

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New CCTV has shown a car, similar to the one Pheobe had been travelling in before she vanished, driving through Gin Gin at 10.30am the day she was last seen - two hours after the teen was thought to have been dropped off at the airport.

The vehicle at the centre of this case is a Hyundai ix35 - owned by Bromley, according to . Police also revealed, on Friday, that they had discovered an item of interest inside a national park.

Cadaver were deployed to search through the Good Night Scrub National Park, just outside of Gin Gin, an hour away from were Pheobe was last seen.

Detective Acting Inspector Ryan Thompson said: "Police are trying to nail down the timeline to where this vehicle has gone. We do have associates that are assisting police with our inquiries at the moment, and this is why we're trying to narrow down that timeline in relation to where Pheobe could be."