The attacker, a junior army officer identified as Sergeant-Major Jakrapanth Thomma, used a stolen M60 machine gun and rifles
"Thank you police and army for ending the situation. Shooter shot dead!!!" Anutin said in a post on Facebook
In many cases, what set off the perpetrator remains a mystery
About 13 hours after Walmart incident, another shooting killed nine in Dayton, Ohio
Unconfirmed video posted on a Twitter page for the Oregon District showed bodies covered with sheets lying on the sidewalk
One suspect was taken into custody while authorities were studying an extremist manifesto purportedly written by the gunman
According to the poll, majority of Americans think the next president should place focus on improving US race relations