At least 26 people were killed after a gunman walked into a church in South Texas and opened fire Sunday, according to authorities.

• 26 killed in Texas church shooting
  
• At least 20 people transported to hospitals
  
• The suspected shooter was killed

The shooting happened at the First Baptist Church in Sutherland Springs, which is 30 miles southeast of San Antonio.

According to authorities, the suspected shooter was dressed in "all black" when he started shooting.

The suspect, identified as Devin Kelley, fled the scene in a vehicle and was killed. It's unclear if it was due to a self-inflicted wound or during a confrontation with a resident.

During a news conference Sunday, Gov. Greg Abbott said that at least 20 people were transported to hospitals. The victims ranged in age from 5 to 72 years old.

The pastor's wife said that the couple's 14-year-old daughter was among those killed.

Sherri Pomeroy and her husband, Pastor Frank Pomeroy, were both out of town when the church was attacked.

Authorities said multiple weapons were found in the Kelley's vehicle.   

Texas Governor Greg Abbott released a statement following the incident:

"While the details of this horrific act are still under investigation, Cecilia and I want to send our sincerest thoughts and prayers to all those who have been affected by this evil act. I want to thank law enforcement for their response and ask that all Texans pray for the Sutherland Springs community during this time of mourning and loss."

President Donald Trump, who is currently in Japan, tweeted about the shooting.

Kelley previously served in the Air Force "at one point," the Pentagon said in a statment.

Sunday's shooting is being called the deadliest mass shooting in the state's history.

Information from The Associated Press was used in this report.