CHARLOTTE, N.C. (AP) — Charlotte authorities believe two missing teenagers are now in Mexico after possibly killing a woman who investigators cannot find.

News outlets report 19-year-old Ahmia Feaster, a 17-year-old boy and 23-year-old Tru Quan Le disappeared last week and have been the targets of a massive search since.

Charlotte-Mecklenburg police Maj. Cam Selvey said Tuesday that Feaster and the 17-year-old have been named in warrants charging them with a possession of a stolen vehicle charge after Le’s car was recovered in Phoenix.

Selvey says Castillo and the 17-year-old are believed to have crossed into Mexico. Le hasn’t been found, and Selvey says they’re concerned for her safety.

Authorities say the three knew each other from working at a local restaurant.

A SUV belonging to Feaster was discovered Saturday in Charlotte.

Selvey says the FBI is also investigating.