An explosion at an illegal fireworks factory in northern India killed at least 23 people, 10 of them children, police said..."There was a house in which fireworks were being made illegally," said police official Rohit Mahajan...Five other houses also collapsed and 18 people were injured...Many families produce fireworks in their homes in hazardous conditions ahead of Diwali -- the festival of lights...A national ban on engaging children in hazardous sectors such as the fireworks industry is largely ignored in India.