A fire at an elementary school in Lahore, Pakistan, left at least 21 children and a teacher with burn injures, officials said. The fire started when the teacher struck a match to light the classroom\'s gas heater, Geo News reported. Firefighters arrived on the scene and put out the flames, a rescue official said. The injured children, all between 10 to 12 years old, and have been admitted to Mayo Hospital, the news report said.