'But then as I started to drive more, the smell and the smoke started to get thicker.
'I just told the kids, let's get off. I evacuated the bus, made sure everyone was off and made them line up against a gate.
Dramatic footage captured at the scene shows the large school bus completely engulfed in flames with thick white smoke billowing out the windows.
The bus, pictured here, had burst into flames only seconds after Williams had ushered all of those onboard to safety
Firefighters attended the scene and Milwaukee Police said they would be investigating how the fire started
Williams, who is expecting a boy, added: 'It feels good seeing the kids this morning and having them thanking me, the school thanking me.
'As soon as we stepped of the bus, I turned around and the bus was just in flames.'
Williams, who is expecting a boy, added: 'It feels good seeing the kids this morning and having them thanking me, the school thanking me.
'If it was my kid on the bus, I would want the bus driver to do the exact same thing.'
In a statement, Milwaukee Police said they would be investigating how the fire started.
They said: 'A bus started to smoke and caught fire. The driver and the occupants were all able to exit.
Pictures captured after the fire was extinguished show the charred remains of the vehicle.
Williams was taken to hospital as a precaution but both her and her baby are doing fine
'No injuries were reported; however, the driver was transported to a local hospital as a precaution.
'The cause of the fire is under investigation; however, does not appear to be suspicious at this time.'
According to