He killed at least 25 people at First Baptist Church on Sunday morning and injured at least as many more.
Sherri Pomeroy, the wife of church pastor Frank Pomeroy, told NBC News that her husband was out of town at the time of the shooting.
The shooting took place at the First Baptist Church in Sutherland Springs, a small community about 30 miles southeast of San Antonio, reports said.
He tweeted: "May God be w/ the people of Sutherland Springs, Texas".
President Donald Trump posted condolences to Twitter Sunday afternoon, saying "May God be w/ the people of Sutherland Springs, Texas".
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Texas Governor Greg Abbott condemned the incident labelling it as an "evil act".
Megan Posey, a spokeswoman for Connally Memorial Medical Centre, which is in Floresville and about 10 miles from the church, said "multiple" victims were being treated for gunshot wounds.
The shooter reportedly walked into the church shortly before noon - at a morning service that witnesses said was normally attended by some 50 people - and opened fire.
Federal law enforcement swarmed the scene to offer assistance, including ATF investigators and members of the FBI's evidence collection team. We will provide more details as they become available. "It's a little church in a very small community. I am monitoring the situation from Japan". The official toll has not yet been verified by law enforcement or local officials.
The Bureau of Alcohol, Tobacco and Firearms said agents from its San Antonio office were responding to the shooting.
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Carrie Matula, who works at a nearby store, told MSNBC the shooting is "devastating". Sources say the man is described as a white male in his mid-20's from outside San Antonio.
"This is something that happens in a big city", she said.
Some victims were taken by medical helicopter to the Brooke Army Medical Center, television station KSAT reported.
Sen. Ted Cruz, R-Texas, tweeted: "Keeping all harmed in Sutherland Springs in our prayers and grateful for our courageous first responders on the scene".
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