Today's massacre is already the worst church shooting in United States history, surpassing the nine killed at a Baptist Church in SC in 2015.
Multiple fatalities have been reported in a shooting that took place inside of a Wilson County church during Sunday service.
The FBI and Texas Rangers are reportedly on the scene.
Sutherland Springs is 30 miles (48 kilometers) southeast of San Antonio.
Abbott tweeted: "Our prayers are with all who were harmed by this evil act".
The gunman was identified as Devin Patrick Kelley, according to a CBS News law enforcement source.
Keeping all harmed in Sutherland Springs in our prayers and grateful for our courageous first responders on the scene.
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Local ABC affiliate KSAT 12 reported the gunman entered the church at around 11:30 local time (6.30am NZDT).
Joseph Silva, 49, who lives about seven kilometres northeast of Sutherland Springs, said the police had instructed his family and neighbors to stay indoors.
Constable Thomas Silvas, an officer from Wilson County, told Fox News officials were working on removing the bodies, but did not specify the number of people who were dead or wounded. He said that the gunman was dead and that he did not know how many people had died.
The FBI is on the scene, according to reports.
Eight of the wounded were transported to Brooke Army Medical Center and and seven others to area hospitals.
Local news outlets report that several people have been shot at a church in South Texas.
Within minutes of the gunfire, emergency personnel arrived at the scene, she said.