Queensland police have seized several items during the search for missing teenager Pheobe Bishop, prompting investigators to expand the search zone.

On Monday, police said the items were found in the Good Night Scrub area that “are believed to be linked to the investigation” and are now undergoing forensic examination, police said.

WATCH THE VIDEO ABOVE: Search for missing Queensland teen Pheobe Bishop continues.

Know the news with the 7NEWS app: Download today

“The items located can’t be disclosed as this could impact the investigation and the items are currently undergoing forensic examination,” police said.

Pheobe, 17, was reported missing 11 days ago, with her disappearance sparking a major search operation in the remote bushland area west of Bundaberg.

Detectives have now widened the search zone after recent developments indicated some evidence may have been moved before officers arrived on scene.

“Some key materials may have been moved from the Good Night Scrub area prior to police arrival,” investigators said.

Authorities are again calling for public assistance, asking anyone with relevant information to come forward.

“Detectives are now appealing to anyone with information, vision or sightings of a grey Hyundai ix35 between May 15 to 18 in the greater Gin Gin area to contact police,” a spokesperson added.

The teenager was due to catch a flight to Western Australia on May 15, but she never made it to Bundaberg Airport.

“As we enter day 11 of Pheobe still not being home our numbness to our tears, to our hearts breaking and this hell is heavy,” her mother Kylie Johnson said on Monday morning.

“Not knowing what to say, what to do or even how to continue to live in this cyclone of uncertainty.

“The tears come, the anger and frustrations come and most of all our hearts are shattering more and more each day.”

The statements come as cadaver dogs have reportedly been brought in to help locate the missing Bundaberg teen.

Police searched bushland in the Good Night Scrub National Park on Sunday, after expanding the search area on Friday.

This included the national park near Gin Gin, where forensic teams have been spotted collecting and bagging items.

Firefighters, SES crews and specialist police, including police divers, have been searching remote areas near Good Night, deploying drones to scan dense scrub and creek beds.

“Obviously, as time goes by, police have greater concerns as to her disappearance,” Detective Acting Inspector Ryan Thompson said.

“There’s no specific persons of interest. However, police are following up all avenues of inquiry.”

A grey Hyundai ix35, in which Bishop was last seen travelling, has since been seized by police.

Bishop had been living with two housemates, Tanika Bromley and James Wood, at a derelict property in Gin Gin, about 40 minutes west of Bundaberg.

That property has now been declared a crime scene.

Bromley and Wood, who are believed to be in a relationship, have been co-operating with police.

Authorities have emphasised that there is no suggestion either is involved in Bishop’s disappearance.