The Transportation Department says at least two Tesla electric cars caught fire after metal debris hit the underbelly. Government safety regulators are opening an investigation into the problem. Norah... more 
The Transportation Department says at least two Tesla electric cars caught fire after metal debris hit the underbelly. Government safety regulators are opening an investigation into the problem. Norah O'Donnell reports. less 
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Tue, Nov 19, 2013 9:11 AM EST