U.S. safety regulators are investigating reports that side curtain air bags can inflate for no reason on some Mazda CX-9 large SUVs. Documents posted yesterday by the National Highway Traffic Safety Administration say two owners have complained about the problem. Four people were hurt in one of the cases. In both complaints owners told the agency that the left and right air bags went off for no reason while the SUVs were moving. This probe covers CX-9s from the 2010 through 2013 model years.
