In this May 7, 2012, photo, Jean Jacobs, left, and Patty Klang pose for a photo in downtown St. Cloud, Minn. at the site of a 1998 gas explosion that killed their husbands. An Associated Press ... more 
In this May 7, 2012, photo, Jean Jacobs, left, and Patty Klang pose for a photo in downtown St. Cloud, Minn. at the site of a 1998 gas explosion that killed their husbands. An Associated Press investigation has found since 1968, there have been at least 270 natural gas accidents in the U.S. that could have been prevented or made less dangerous by an inexpensive valve that cuts off leaking gas. At least 67 people have been killed and more than 350 hurt. Yet nearly 90 percent of the nation's gas service lines aren't fitted with the valves. (AP Photo/Amy Forliti.) less 
1 / 3
Associated Press | Photo By Amy Forliti.
Mon, Jul 23, 2012 4:43 PM EDT