Handgun or rifle rounds?
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The shots, which witnesses said they believed originated from the top of a hill about 220 yards directly across from the station,
http://www.nytimes.com/2015/03/13/us/ferguson-police.html?WT.mc_id=2015-MAR-AOL-VIEWED_AUDDEV-0305-0331&WT.mc_ev=click&ad-keywords=AUDDEVMAR&icid=maing-grid7%7Chp-desktop%7Cdl1%7Csec1_lnk2%26pLid%3D626747#
A grassy knoll, by chance?!