ABC News: 'It lasted about 15 seconds': At least 27 dead in Texas church shooting

At least 27 people were killed and 27 others injured in a mass shooting at a church in rural Texas this morning, a law enforcement official told ABC News.

The alleged shooter, who has not been identified, is dead following the massacre in Sutherland Springs, about 40 miles Southeast of sSan Antonio, authorities said.

Among those killed at the First Baptist Church was a 14-year-old girl named Annabelle Renee Pomeroy, according to her father, Frank Pomeroy, who is a pastor at the church.

Annabelle “was one very beautiful, special child,” Pomeroy told ABC News by phone.

Pomeroy said he was in Oklahoma this morning -- a rare weekend that he wasn't at the church.

The other victims are all close friends of his, he said.

Last sunday, Pomeroy delivered a sermon at the church, encouraging parishioners to "Lean on the Lord," even when circumstances don't make sense.

"Trust in the lord with all your heart and do not rely, or lean, on your own understanding," he said. "You see god's understanding is far greater and there may be things that are taking place that you don't understand but you still need to do what god's calling you to do."

A woman who said she works at a gas station across the street from the church told ABC News she heard rapid gunfire around 11:15 A.M.

Congregants fled the church and ran to the station cowering for cover, she said.

“We heard several shots and we all started running inside the store,” said the woman, who said she is 49 but declined to give her name.

“It lasted about 15 seconds," she said. "I yelled, ‘Get down! Get inside!’ and we all went into hiding.”

Within minutes of the gunfire, emergency personnel arrived at the scene, she said.

She said the gas station locked its doors and has not reopened.

A church turns into a crime scene

The First Baptist Church is an unassuming, white building with a red-hued door, with numerous flags in front, including an American flag and one for the lone star state. It’s on what appears to be a dusty road in a rural area.

Police formed a perimeter around the church and flooded its grounds with emergency and police vehicles, according to ABC affiliate KSAT-TV in San Antonio. Agents from the FBI and ATF have responded to the scene.

Paul Buford, a pastor at a church just a couple of miles away in Sutherland Springs, told KSAT-TV that his congregation was in the middle of their service at river oaks church when they started getting calls about the shooting.

Members of his church who are first responders rushed out while the rest of the congregation immediately started praying.

Authorities identified the shooter as Devin Kelley, 26, of New Braunfels, Texas, which is about 35 miles from Sutherland Springs, federal and state law enforcement sources told ABC News.

The investigation into his background is unfolding. The suspect’s Facebook profile appeared to show a picture of an AR-15 –style gun. A Linkedin account that is believed to be associated with the shooter suggested that he had a military background.

At this point, today's church massacre is the fourth deadliest mass shooting in recent U.S history, after Las Vegas, Orlando and Virginia Tech.

President Donald Trump, who is in Japan, tweeted, "May God be w/ the people of Sutherland Springs, Texas."

Trump has been briefed “several times” and is continuing to receive regular updates, said White House Press Secretary Sarah Sanders.

Texas Gov. Greg Abbott said in a statement, "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."

Texas Attorney General Ken Paxton said in a statement, "The thoughts and prayers of all Texans are with the people of Sutherland springs as tragic reports come out of first baptist church."

"Please join Angela and me as we pray for those impacted by this horrific shooting,” Paxton said.

This marks the third mass shooting at a U.S. Church in the past three years.

Abc News' Jackdate, Pierre Thomas, Mike Levine, Aaron Katersky, Michael Delmoro and Joi-Marie Mckenzie contributed to this report.