The February 14 shooting in the Stoneman Douglas High School in Parkland, Florida, reminded us once again about the horrific toll of gun violence on the United States. This was the 18th school shooting in the US this year; in Parkland, 17 students were killed and about as many were injured. The shooter used an AR-15 semi-automatic rifle, the same weapon used in many other high-profile mass shootings, including Sandy Hook. These guns have been widely available in the United States ever since Congress allowed the federal assault weapons ban to expire in 2004.
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