CHATTANOOGA, Tenn. -- Chattanooga police say a sixth child has died from a school bus crash.

A tweet from the police department Wednesday evening said the agency had received confirmation of the death.

Police say the bus was traveling too fast when it veered off a narrow, winding road and crashed into a tree Monday afternoon. The driver, 24-year-old Johnthony Walker, has been arrested and charged with five counts of vehicular homicide.

The police department's tweet did not give the child's name or age.

Earlier, police said toxicology reports on Walker showed no trace of drugs or alcohol.

Chattanooga Police Sgt. Austin Garrett announced that a blood test was conducted on Walker, who is charged with five counts of vehicular homicide.

Police say he was driving well over the posted 30-mph speed limit when he lost control of the bus.

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