Police treating speed 'very, very strongly' as factor in crash that killed five schoolchildren

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.

Describing the incident as "every public safety professional's worst nightmare", Chattanooga Police Chief Fred Fletcher told a news conference that 24-year-old bus driver Johnthony Walker had been charged with five counts of vehicular homicide as well as reckless driving and reckless endangerment.