A123 Systems (AONE -7.6%) tumbles after two Senators join a Congressman in questioning the company's $450M investment from China's Wanxiang Group. The White House has tried to soothe concerns by stating none of A123's DOE funds will go to building overseas facilities. Yesterday, A123 fell on news a Fisker Karma sedan, which uses A123's batteries, had caught fire. Fisker replaced its CEO today.
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