KOSIK: Almost 8 million cars being recalled because their air bags may explode and spit sharp metal objects into the drivers and passengers.</s>BLACKWELL: Yes, but that recall could expand and go nationwide after at least four deaths have been linked to the defect. CNN's Rene Marsh reports on the latest in this investigation.</s>RENE MARSH, CNN AVIATION AND GOVERNMENT REGULATION CORRESPONDENT: Alison, Victor, more cars could be recalled over exploding air bags that shoot metal shrapnel at passengers. That comes from a senior administration official. Right now, the focus is vehicles in states with warm humid climates. But the pressure is on to expand the recall nationwide. Meantime, federal prosecutors are looking into weather Japanese airbag manufacturer Takata was truthful about what it knew of the defects. And the lawmakers on Capitol Hill, they are questioning if the government agency that handles recalls is doing enough to keep drivers and passengers safe. This week, the national safety traffic administration, they put out an urgent warning to nearly 8 million car owners to immediately get defective air bags replaced. Now, some air bags manufactured by Takata, they expand so fast the metal inflator ruptures and that sends metal flying. That could cause serious injury or even death. Now, at first, NHTSA said 4.5 million vehicles were infected but later corrected that, it's actually nearly 8 million. A senior official says a review is under way to make sure a mistake like that doesn't happen again. And the agency safety culture is under review with a focus on its risk management procedures -- essentially, should NHTSA have acted with urgency to recall these cars sooner -- Alison, Victor.</s>BLACKWELL: All right. Rene Marsh in Washington -- thank you so much. And coming up in our 8:00 Eastern Hour, we'll talk more about the recall expansion with Clarence Ditlow, he's executive director of the Center of Auto Safety. And ahead, more on our top stories this morning. The first person diagnosed with Ebola in New York remains in isolation. We're going to take you live to Bellevue Hospital for the latest on Dr. Craig Spencer's condition.
Exploding Airbag Recall Could Expand