NASHVILLE (AP) - The head of the National Highway Traffic Safety Administration is reemphasizing the agency's call for seat belts on school buses in the aftermath of a crash in Chattanooga that killed six students.

Administrator Mark Rosekind said at a transportation safety conference in Washington on Thursday that while school buses remain the safest way for children to get to and from school, there are ways to make them safer.

Rosekind noted that the bus that crashed in Tennessee was not equipped with seat belts. He says the recent crash reminds people that there is no more tragic crash than when children are involved.

Federal regulators for the first time called for three-point seat belt on school buses in November 2015.