Isabel Celis' parents returned separately to their home this morning. Both were accompanied by investigators.
In his daily news conference, Tucson Police Lt. Fabian Pacheco said the family is still cooperating and assisting with the investigation. He said the police were not serving a search warrant - the investigators were there with the parents' permission.
Investigators brought the family members to the house "to speak with them there and evaluate the scene," Pacheco said.
Shortly after 11:30 today, investigators arrived in two cars and entered the house through the garage with a man who appeared to be Sergio Celis. After he left, Rebecca Celis arrived.
Investigators later brought another person into the home who appeared to be a boy in his teens.
At the time, police did not confirm the identities of any of the people brought to the house.
Pacheco said they are not focusing on any one suspect in particular, but "nobody has been ruled out."
Pacheco said police have received about 500 tips, but TPD and the FBI are still working on all aspects of investigation. He said they are not limited to incoming tips yet.
He said a handful of sightings were reported in Sonora, Mexico, last week, but nothing came of those tips.
Meanwhile, the house is now decorated with two new banners calling for the safe return of Isabel Celis.
There are no confirmed reports that the Celis family has returned to live in the residence on Tucson's east side, and it is unknown who placed the banners on the home.
Isabel Celis was last seen in her home 13 days ago.
Copyright 2012 Tucson New Now. All rights reserved.