Authorities have released new footage that may show a Texas teen who vanished outside her home on Christmas Eve.

Camila Mendoza Olmos, 19, was last seen leaving her house in San Antonio for her regular morning walk. The search, now going on for nearly a week, has turned up few clues and her parents say they are praying for her safe return.

On Monday, local authorities released dashcam video that they said might show the missing woman walking near her home.

Bexar County Sheriff Javier Salazar told a news conference that he couldn't say for certain it was her, but the person's clothing in the video "certainly does match up with what she was wearing".

Salazar said authorities were looking into all potential scenarios in their search, adding that the sheriff's department was working with the FBI on the case.