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GM is facing multiple investigations by US authorities over its slowness to react to evidence linking a defective ignition switch to 31 accidents and 12 deaths in its 2005-7 Chevrolet Cobalt and 2003-7 Saturn Ion models. The problem was detected at the pre-production stage as early as 2001, but GM waited until last month to recall 1.6 million vehicles in North America. Monday's recall covered three different defects unrelated to the ignition problems, none tied to reports of accidents or injuries, GM said. The ignition recall is the first big crisis for new chief executive Mary Barra, who took the company's helm on January 15 as the first woman to lead a major automaker.