A former teacher was charged with taking a 14-year-old student to Mexico after the two were found at a hotel near the Texas border, the FBI said.

Mexican authorities found Angela Comer, 26, on Tuesday night in Nuevo Laredo. The teenager's grandmother had reported him missing Saturday.

Authorities in Kentucky were investigating whether the two had a sexual relationship.

The teen likely left with Comer "at his own free will," said Tompkinsville police officer T.J. Hestand.

Comer's 3-year-old son, who was with her at the hotel, and the teen were taken into protective custody by police in Laredo, Texas.

The former math teacher was expected to be brought back to Kentucky by the end of the week to face a felony charge of custodial interference for taking the teen away from his grandmother.

She had resigned from her job in November.

Cromer also faces a federal charge of unlawful flight to avoid prosecution because she crossed the border, said Steven Gurley, special agent in charge of the Kentucky FBI.

She already faces a November charge for trying the coax the boy into disobeying his grandmother, who had forbidden communication between the teen and the teacher, said Monroe County Attorney Wes Stephens.