"The school bus industry is changing," says one expert. "We are going to go through the largest transformation the industry has ever seen in its 100-plus years of existence. And that's because electric is here, and it's not going away."

The fourth special legislative session this year ended without any increased funding for school safety—even though public schools have complained for months they don't have enough money to meet new safety mandates approved this year.

In an email sent out to students' families Sunday night, Princeton City Schools Superintendent G. Elgin Card said the threat, first received by one of the district's elementary school administrators, was not credible. The Oak Hills Local School District told families the same thing in a message.