"Police sources identified the driver as Martin Birkman, a BMW brand manager and test driver. The vehicle, which had New Jersey dealer plates, appeared to be a new version of the BMW X6.
Birkman apparently didn***8217;t press the correct button on his key fob to remotely turn off the engine to his car, and it runs so silently that he didn***8217;t even notice it was still on when he left, a source said."


http://www.nypost.com/p/news/local/bomb_scare_outside_museum_of_natural_aqJMqtShf57d9X4WcZRrNK

Edit: Jalopnik says it was an X3 prototype http://jalopnik.com/5534703/clueless-new-yorkers-mistake-prototype-bmw-for-car-bomb