The incident, which left at least 20 other people injured, occurred yesterday at the First Baptist Church in Sutherland Springs in Wilson County where a man in "full gear" barged into the church and began shooting parishioners.
Gamez told NBC that there were multiple deaths and injuries but an exact number was not available.
Wilson County Sheriff Joe Tackitt told The Wilson County News that the shooter has been killed.
The person who confronted the suspect at the church and another man were in a auto that chased him between 6-8 miles away to Guadalupe County.
He said the Texas Rangers have taken over the investigation.
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The FBI and Bureau of Alcohol, Tobacco, Firearms and Explosives were assisting in the aftermath of the shooting, according to the Associated Press. Eight of the wounded were transported to Brooke Army Medical Center and and seven others to area hospitals. The hospital is in Floresville, Texas.
University Health System in San Antonio it was caring for 10 patients, at least four of them children.
Shooter walked into the church shortly before noon and opened fire.
"Our prayers are with all who were harmed by this evil act", Gov. Greg Abbott said on Twitter.
Federal law enforcement swarmed the scene to offer assistance, including ATF investigators and members of the FBI's evidence collection team. "More details from DPS (Department of Public Safety) soon".
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He said India is also rapidly progressing on the Global Innovation Index, Global Logistics Index and Global Competitiveness Index. Germany, Japan and Denmark are partner countries to World Food India, while Italy and the Netherlands are the focus countries.
The governor also ordered all Texas flags lowered to half staff until Thursday to honor the lives lost in the shooting.
One of the victims of the mass shooting was the church's pastor Frank Pomeroy's daughter, Annabelle.
The exact number of victims in the attack at the First Baptist Church in Sutherland Springs wasn't immediately known.
President Trump tweeted from his trip to Asia: "May God be w/ the people of Sutherland Springs, Texas". The official toll has not yet been verified by law enforcement or local officials. "I am monitoring the situation from Japan", Trump tweeted. No name has been released and no motive identified, although authorities are minutes away from holding a press conference.
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And O'Connor asked, you know, people are upset that the Justice Department isn't going after Hillary Clinton. Sessions responded, but by answering a completely different question.