LOUISVILLE, Ky. — High schoolers in Jefferson County Public Schools returned to class Monday—10 days after the first day of class due to a so-called "transportation disaster" that saw some students not make it home from school until nearly 10 p.m.

There were four reported accidents involving JCPS buses Monday morning, officials said. All of the "bus incidents" did not involve injuries.

Here's a breakdown of Monday's JCPS bus accidents, according to Louisville Metro Police:

• 6:36 a.m. – Holbart Court and Estate Drive (One student on board)
• 6:52 a.m. – Blankenbaker Lane and Clarkwood Road (Seven students on board)
• 7:03 a.m. – Six Mile Lane and Bardstown Road (Unknown number of students on board)
• 8:10 a.m. – 3600 block of Chenoweth Run Road (One student on board)

The staggered re-launch of the school year saw elementary and middle school students resume classes Friday. All students were reportedly dropped off at home before 8 p.m. Friday, officials said.

School officials advised parents in a note Thursday that they “expect some buses may drop children off at stops later than expected," Friday. They also encouraged parents who could make alternate transportation arrangements to do so.

The district, Kentucky's largest by far, serves roughly 65,000 bus riders.

Some of the blame has been heaped on a contractor the district hired to redraw its bus routes. The changes by AlphaRoute led to some students not being picked up in the morning and others not getting home until nearly 10 p.m.

The company said it sent a team to Louisville to help address problems.

This is a developing story. Check back later for updates from Spectrum News.