Still no sign of missing NT woman

Grave fears are now held for the welfare of a Northern Territory woman missing in central Australia for 11 days.

An extensive search for mother-of-two Angie Fuller has failed to find any trace of the 30-year-old.

Ms Fuller was last seen alive early on January 10 on the Tanami Road, north of Alice Springs. Around the time she went missing there was an incident involving people in two cars which is also a subject of police inquiries.

Assistant Commissioner Michael White said the search had now covered 380 square kilometres without luck.

"We certainly hold great fears for her safety. We've been working very closely with her family to make sure they're fully across what's going on," he said.

"As you can imagine it's a very stressful time for them.

"She has two young children. She's made no contact with the children and that's very unusual for her."

Mr White said Ms Fuller had not accessed her bank accounts since going missing and had not engaged with social media of any kind.

As well as the ongoing search, police have also launched a wider missing person investigation.

That has involved interviewing friends and associates and trying to establish her more recent activity.

They have also spoken with a man who claimed to be her boyfriend in a rambling video posted on social media in the days after she went missing.

In the video, the man said the pair were run off the road and then shot at by a gang before fleeing into the bush.

Mr White said while efforts involving foot patrols, helicopters, drones and all-terrain vehicles were continuing at some point police would need to make a decision on whether to suspend the search.

He said the area involved was unusually green because of heavier rain over recent months and that had thrown up additional challenges.

At the same time that meant there was water available that could be keeping Ms Fuller alive.

"It's possible she's still out there walking around. It's possible that she's avoiding us," he said.

"It's possible that something untoward has happened to her or she's succumbed to the environment."