It's been nine days, and there's still no sign of Elizabeth Thomas or ex-teacher Tad Cummins, the subjects of Amber Alerts in Tennessee and Alabama.

But, new details continue to emerge about Cummins' efforts to groom and lure 15-year-old Thomas, his former student, before abducting her last week.

Before the two disappeared March 13, 50-year-old Cummins searched "teen marriage" online, the Tennessee Bureau of Investigation announced. Cummins also searched whether police could track his car, a Nissan Rogue, according to TBI.

Thomas' father, Anthony, spoke publicly about her disappearance and pleaded with his daughter to run from Cummins.

"Izzy please, get away from him, get away from him, run somewhere, tell somebody," her father said, according to CBS News.

Thomas was a freshman at Culleoka Unit School, where Cummins taught health sciences until he was fired last week. Cummins, who was accused of kissing Thomas in January, is wanted for having sexual contact with her. Cummins wasn't fired by the Maury County, Tennessee school system until the day after they disappeared.

Ashlee Riggins, Thomas' best friend, told CBS that her friend said she was "falling in love with someone." But Riggins didn't realize Thomas was talking about Cummins.

"I know that you may love him and think that he's perfect but he's not," Riggins said, according to CBS.

On Tuesday, the Tennessee Bureau of Investigation released a photo that was taken in Cummins' classroom in January, just before he's accused of having sexual contact with Thomas.

Cummins is wanted in Tennessee on charges of kidnapping and having sexual contact with Thomas, a minor.

Amber Alerts issued in Alabama and Tennessee have resulted in more than 650 tips submitted to TBI, but no credible leads have been established.

TBI is asking the public to remain vigilant, particularly in remote, secluded areas. With the low number of tips its received, the Bureau believes Cummins is keeping Thomas in places outside the public view. Those places may include campgrounds, large parking lots or garages and parks.

Cummins, who is believed to be armed with multiple guns, may still be driving a silver Nissan Rogue with Tennessee tag 976-ZPT.

Thomas is white with blonde hair and hazel eyes. She is 5 feet 5 inches and weighs 120 pounds. She was last seen wearing a flannel shirt and black leggings when a friend dropped her off at Shoney's restaurant in Columbia, Tennessee early on the morning on March 13.

Cummins' last known location was Decatur, Alabama later that day. He is a white male with brown hair and eyes. He is 6 feet and weighs about 200 pounds.

Cummins, who is believed to be armed with multiple guns, may still be driving a silver Nissan Rogue with Tennessee tag 976-ZPT.

Anyone with information is asked to call 1-800-TBI-FIND. Anyone who sees Cummins, Thomas or the vehicle should call 911.