Missing 19-year-old Camila Mendoza Olmos believed to be 'in imminent danger,' Texas sheriff says

Bexar County Sheriff Javier Salazar indicated that authorities believe that Camila Mendoza Olmos, a 19-year-old woman who went missing on Christmas Eve, is "in imminent danger."

The FBI is supplying technical aid and the Homeland Security Department is keeping an eye on border crossings as well as international travel, Salazar indicated, according to ABC News. 

"We definitely don't want to miss anything," he said, according to the outlet. "The ground search is somewhat limited to a couple of square miles.