Updated at 4:44 p.m. to show TBI determined Tad Cummins and Elizabeth Thomas were not sighted in Collierville, Tennessee today.

Tennessee authorities investigated but couldn't substantiate a possible sighting this afternoon of Tad Cummins, the ex-teacher accused of abducting Elizabeth Thomas.

The Tennessee Bureau of Investigation said it has confirmed Cummins was not the person spotted at a gas station in Collierville, Tennessee.

UPDATE: The TBI has determined the reported sighting in Collierville, TN was not, in fact, Tad Cummins and Elizabeth Thomas. #TNAMBERAlert pic.twitter.com/jwuLFyaYGz — Josh DeVine (@TBIJoshDeVine) March 30, 2017

More than 1,100 tips had been submitted as a result of Amber Alerts in Tennessee and Alabama as of Tuesday, TBI said.

Cummins is wanted for kidnapping and having sexual contact with Thomas, who was his student at Culleoka Unit School in Maury County, Tennessee. The two have been missing since March 13.

Authorities have said Cummins lured and groomed Thomas before the kidnapping.

Cummins was fired by the school system the day after the abduction, although as far back as January the two were caught kissing in his classroom.

Read more about how the school system handled the situation here.

A former student of Cummins told Inside Edition in an interview that aired this week that the ex-teacher wrote a love song for her years ago. Although Destany Parrish says nothing inappropriate ever happened, the two were close when she was his student. Parrish shared audio footage with Inside Edition that she claims is Cummins singing the song to her at the school.

Authorities are encouraging the public to share information about the Amber Alert with anyone they know south of the U.S. border. While investigators don't have any information placing Thomas and Cummins in Mexico, they say it's possible the two have made it that far. Mexican police have been notified about the case.

The public is asked to remain vigilant, particularly in rural or secluded area. Hunters are asked to be on the lookout for Cummins and Thomas. Investigators are asking people to be vigilant in parking garages and lots, parks, campgrounds and other "off-the-grid" places.

Thomas is a white female with strawberry or blonde hair and hazel eyes. She is 5 feet and weighs about 120 pounds.

Cummins, believed to be armed with multiple guns, is a white male with brown hair and eyes. He is six feet and about 200 pounds.

They may be traveling in a silver Nissan Rogue with Tennessee tag 976-ZPT.