Maybe a smoke bomb??.........I think it was just the current occupants of the white house passing gas....... fartt ==fart
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http://www.huffingtonpost.com/2012/01/17/white-house-lock-down_n_1211982.html?icid=maing-grid7%7Cmain5%7Cdl1%7Csec3_lnk1%26pLid%3D128385 (http://www.huffingtonpost.com/2012/01/17/white-house-lock-down_n_1211982.html?icid=maing-grid7%7Cmain5%7Cdl1%7Csec3_lnk1%26pLid%3D128385)