The bulldozer was clearing land outside a day care center in Hapeville, Ga., when it broke open a buried 1-inch pipeline. The escaping gas ignited into a fireball that killed nine people, including seven children settling down for their afternoon naps.
That was 1968. Since then, there have been at least 270 similar accidents across the country that could have been prevented or made less dangerous by a valve that cuts off leaking gas and costs as little as $10-$15 for homes and small businesses and $200-$300 for larger buildings, an Associated Press investigation found.
