Karachi- At least three people were killed and 21 others wounded in two separate road accidents today. Rescue sources said three people of a family were killed and another person was wounded when two vehicles collided near Kathor bridge at Super Highway. In another road mishap, twenty people including women and children sustained injuries when a bus from Karachi collided with a bus coming from the opposite direction near Thatta. The injured were taken to Gharo hospital. The condition of several people is said to be critical.