At least 16 people, including several children, were killed and 120 others injured on Monday when a powerful explosion in a small village in Pakistan's Punjab province flattened a madrassa, which was being used to make bombs, officials said. The blast, which occurred shortly before 10 am local time in the village near Mian Channu in southern Punjab, was caused by explosives stored in the home of madrasa teacher Riaz Ali, local residents said.