Tad Cummins is accused of kidnapping Elizabeth Thomas. (AP)
Corpus Christi police said they have been unable to substantiate a tip that a Tennessee school teacher and a student he's accused of kidnapping were in the South Texas Gulf Coast city.
Tennessee authorities have been hunting for 50-year-old Tad Cummins and 15-year-old Elizabeth Thomas, who last was seen March 13.
Tennessee authorities shared a tip with Corpus Christi police that a vehicle matching the description of Cummins' car, with Tennessee tags, had been spotted in the city's North Beach area.
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These images, obtained by Fox affiliate WZTV, shows what Elizabeth Thomas might look like with darker hair.
Police said officers checked the area, businesses and surveillance videos Thursday and can't confirm the information. Police said in a statement they haven't found any credible witnesses placing either the health sciences teacher or the missing teen in the area about 200 miles southwest of Houston.
On Thursday, lawyers representing the Thomas family released photos of what Thomas might look like with dyed hair.
Cummins was added to Tennessee’s Most Wanted List after he was suspected of kidnapping Thomas last week. Authorities issued an Amber Alert for a silver Nissan Rogue with license plate 976ZPT.
Investigators believe Cummins may have abducted the girl to "potentially sexually exploit her."
Cummins was Thomas' former teacher and is wanted for having sexual contact with the teen while teaching at the Culleoka Unit School as a health science teacher.
Maury County Public Schools, meanwhile, announced Friday the formation of a new task force to review parental-notification policies, according to The Tennessean.
The school system said the task force will review notification policies regarding "any range of potential student and/or faculty/staff incidents" and make recommendations for improvements and stronger checks and balances, the newspaper reported.
The Associated Press contributed to this report.
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