A gunman dressed in black tactical-style gear and armed with an assault rifle opened fire inside a small church in Sutherland Springs, Texas, during Sunday services, killing 26 people, including young children, and wounding about 20 others. Here's the latest of what we know.

• The alleged killer been identified as Devin Patrick Kelley, 26. He apparently died of a self inflicted gunshot wound after being shot by a man armed with a rifle who attempted to intervene when Kelley tried to flee, Wilson County Sheriff Joe Tackitt told CNN.   When Kelley sped off in his SUV, the armed man stopped a car driven by Johnnie Langendorff and together they chased the shooter until he crashed his vehicle.

• Kelley, who lived in a San Antonio suburb, received a bad conduct discharge from the Air Force after he was convicted at a court martial in 2012 for assaulting his spouse and child and was sentenced to one year confinement. That should have prevented him from buying the assault rifle and two handguns officials found in his SUV. The ATF is investigating how he came to purchase the weapons in Texas and Colorado.

• Officials said the shooting followed an ongoing "domestic" dispute between Kelley and his former mother-in-law who attended the church and had received threatening texts from him. She was not at the church Sunday. Race and religion were not factors, they said.

• Among the dead were several children, the pastor's 14-year-old daughter, and eight members of the same family, including a woman who was pregnant.

• The massacre was the fifth deadliest mass shooting in the United States and the worst in Texas since the modern era of fatal mass shootings in the nation began in 1949, when Howard Unruh shot and killed 13 people in Camden, N.J. It also came on the eighth anniversary of a shooting by a U.S. Army major at Texas' Fort Hood that left 13 people dead and 31 others wounded.

• President Trump, in Japan at the start of his Asian tour, said the mass shooting was "a mental health problem at the highest level" and not about guns.