Authorities nationwide are on alert and on the lookout for a 13-year-old Nebraska boy and the teacher he's believed to be with.

Lexington Police say 13-year-old Fernando Rodriguez was last seen Friday and he is believed to be with his sixth-grade teacher, 25-year-old Kelsey Peterson.

An arrest warrant has been issued for Peterson charging her with kidnapping, child abuse and contributing to the delinquency of a minor.

The teacher and basketball coach at Lexington Middle School was placed on administrative leave last week, a day before her alleged young lover disappeared.

Authorities believed the two are traveling together in Peterson's white Pontiac and police nationwide have been notified about them.

Court documents showed authorities had recovered several e-mails and letters in which the two professed their affection for one another.

Rodriguez did contact his family last weekend. His aunt tells police he asked whether a visa or passport was required to travel to Mexico.

The Nebraska State Patrol says an Amber Alert was not issued because this case did not match certain criteria. Mainly, that police don't believe Rodriguez was abducted and they don't believe his life is in danger.