The driver of a school bus in the US that was filled with elementary students when it crashed in Chattanooga, killing at least five children, has been arrested and faces charges including vehicular homicide.

Bloodied pupils lay on stretchers, while other children walked away dazed with their parents after a school bus crash that killed six on Monday in Tennessee.

As much of the US debates the use of lethal injections against a backdrop of drug scarcity and botched executions, Tennessee has found an alternative — the electric chair.