Atleast 21 people, including nine women, were killed when a speeding ST bus collided with an auto-rickshaw, causing both the vehicles to fall into a roadside well in Maharashtra's Nashik-district the police said. More than 18 people also suffered injuries in the accident which took place at around 4-pm at Meshi Phata on the Malegaon-Deola Road in the North-Maharashtra-district, around 200km, an official said.