NASHVILLE, Tenn. -

The Tennessee Bureau of Investigation has issued a statewide alert after a car wanted in a Florida child abduction was believed seen in southeast Tennessee.

The TBI said the kidnapping occurred in Florida when 2-year-old Chase and 4-year-old Cole Hakken were taken from their custodial grandmother in Tampa.

Police say they are possibly with the biological parents, Sharyn and Joshua Hakken, neither of whom have custody of the children. Authorities said according to the grandmother, the parents tied her up and took off with the kids in her 2009 silver Toyota Camry.

The TBI said the couple are believed to be armed and are considered dangerous. Police are working on putting up billboards with information about the children across the southwest and southeast portions of the country.

They were traveling in a 2006 black GMC pickup truck, bearing Florida license number U95KT. The vehicle may have been spotted in Etowah at about 8 p.m. Wednesday.

According to news partner TPSB, the couple's custody rights were taken away by Louisiana officials on Tuesday, the day before the kids were taken.

Tips should be phoned to (800) TBI-FIND.