growing number of mass killings more than 900 people more than 900 people USA Today more than 900 people more than 900 people shootings more than 900 people 900 victims since 2006 900 victims since 2006 Mass shootings mass shootings in last 7 years more than 900 people more than 900 people more than 900 people more than 900 people more than 900 people more than 900 people USA Today USA Today: more than 900 people more than 900 people USA Today USA Today more than 900 people less than 1% of gun fatalities in the United States more than 900 people mess in US more than 900 people USA Today Mass shootings toll exceeds 900 in past seven years According to USA Today’s analysis more than 900 people more than 900 people USA Today more than 900 people more than 900 people more than 900 people more than 900 people told USA Today Thursday more than 900 people more than 900 people USA Today: shootings USA Today Mass shootings mass shootings in last 7 years USA Today USA Today USA Today: USA Today USA Today analysis USA Today shootings USA Today