The LAPD announced Dec. 2 that they last had eyes on Hannah crossing the border from San Ysidro into Mexico on Nov. 12, alone and carrying her luggage.
Investigators from the department's Missing Persons Unit went to the border Dec. 1 and viewed surveillance video from U.S. Customs and Border Protection that showed her walking into Mexico, police said.
Hannah is now considered a voluntary missing person, according to the LAPD, which noted that she is not a suspect in any criminal activity, nor has their investigation uncovered any evidence of human trafficking or foul play.
"Our priority is ensuring Ms. Kobayashi's safety and well-being," LAPD Chief Jim McDonnell said at a news conference. "We urge Ms. Kobayashi to contact her family, law enforcement or personnel at the U.S. Embassy to let us know she is safe. She has the right to privacy, and we respect her choices, but we also understand the concern her loved ones feel. A simple message could reassure those who care about her."
In a statement to NBC News, Hannah's family said they remained hopeful that she was safe and they were still looking for her.
"The search is far from over," they said Dec. 3, "and we are committed to doing everything possible to bring her home safely. We want answers and a resolution that ensures Hannah’s safety and urge law enforcement and the public to stay focused on finding her and to avoid speculative conclusions."