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"I bet your children are not driving those cars," says mother of first victim linked to GM's ignition defect
With an ignition-switch defect identified a decade ago, GM's timeliness is now under federal investigation
Some Saturns and Chevy SUVs, more Pontiacs now part of ignition switch-related callback; critics say earlier recall might have prevented deaths
Relatives of people killed in crashes linked to ignition problem want to know why the recall wasn't issued earlier
Engines can shut down unexpectedly and cause crashes; company says six people have been killed in crashes related to the problem
