At least 26 people were killed and at least 20 injured after the shooting at First Baptist Church in Sutherland Springs.
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The suspect was found dead in his vehicle at the county line. It was unclear if the attacker died of a self-inflicted wound or if he was shot by a resident who confronted him.
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Wilson County Sheriff Joe Tackitt told a local newspaper that a man walked into a Baptist church in Sutherland Springs, Texas, and opened fire, leaving multiple people dead.
Here is more on what we know about Kelley:
-Air Force officials confirmed to ABC News he served in the U.S. Air Force from 2010 until he was discharged for allegedly assaulting his spouse and child. .
-An Air Force spokeswoman said Kelley served 12 months' confinement after a 2012 court-martial. He ultimately received a bad conduct discharge and reduction in rank.
-He was able to purchase an assault rifle despite a law that restricts firearms from people convicted of domestic violence.
-He was dressed in all black with tactical-type gear and was wearing a ballistic vest.
-He was at a Valero gas station before he drove across the street to the church, exited his vehicle and opened fire, according to officials from the Texas Department of Public Safety.
-He moved to the right side of the church and continued to fire, before he entered the church and shot people inside.
-As he exited the church, a local resident grabbed his rifle and "engaged" the suspect. The suspect dropped what was described as a Ruger AR assault-type rifle and fled from the church.
-The local citizen pursued the suspect and when law enforcement responded, the suspect crashed and was found deceased in his vehicle.
-Multiple weapons were found in the vehicle, and the vehicle was being processed by special operations group bomb techs.
-Authorities are searching his social media accounts and said that on Facebook in recent days, he showed off what appeared to be an AR-15-style gun.
-An ATF source said that agents are searching the alleged shooter's home for explosives.
-A U.S. official told the AP that Kelley lived in a San Antonio suburb and that he doesn't appear to be linked to organized terrorist groups.
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(The Associated Press contributed to this report.)