Texas school shooting: Suspect's grandmother upgraded to good condition

As law enforcement officials continue to scrutinize each movement made by alleged gunman Salvador Ramos inside Robb Elementary School, Texas Department of Public Safety Director Steven McCraw said that law enforcement officers shot and killed the suspect roughly 40 minutes to an hour after his first encounter with the school district's resource officer at the building entrance.

"I don’t want to give you a particular timeline. But the bottom line is that law enforcement was there," McCraw told reporters during a briefing Wednesday. "They did engage immediately. They did contain him in the classroom, and they put a tactical stack together in a very orderly way and of course breached.”

McCraw later said that investigators plan to go frame-by-frame through surveillance footage to "track every minute" of the gunman's movement and will provide an update once that work is completed.

-ABC News' Lucien Bruggeman

The suspected Robb Elementary School shooter was not wearing body armor during Tuesday's massacre, multiple law enforcement officials told ABC News.

The alleged gunman was wearing tactical gear, including a vest that could hold ammunition, but there was no armor or fabric that would protect him from gunfire, the sources said.

-ABC News' Matt Gutman, Josh Margolin and Aaron Katersky

President Joe Biden and first lady Jill Biden will be traveling to Texas in the "upcoming days," the president said Wednesday.

The two plan to meet with the victims' families "and let them know that we have a sense, just a sense of their pain. And hopefully bring some little comfort to the community in shock and grief and in trauma," the president said during an address Wednesday afternoon.

The president said he was "sick and tired" of the "carnage" that is happening in the U.S.

"The idea that an 18-year-old can walk into a store and buy weapons of war, designed and marketed to kill, is I think just wrong. Just violates common sense," he said. "Where's the backbone, where's the courage to stand up to a very powerful lobby?"

The accused gunman in Tuesday's deadly school shooting purchased two AR-15-style rifles at Oasis Outback, a federally licensed store located in Uvalde, law enforcement sources told ABC News.

A general manager at Oasis Outback told ABC News that he is working with law enforcement but would not comment on whether the alleged shooter did or did not purchase his guns there.

Oasis Outback is located approximately 3 miles from Robb Elementary School.

According to the Bureau of Alcohol, Tobacco, Firearms and Explosives, the alleged shooter made his gun purchases on two separate days: May 17 and May 20. That means he bought the first AR-15-style rifle one day after he turned 18 and the second four days before the shooting.

Both weapons were purchased at that same store, Steve McCraw, the director of the Texas Department of Public Safety, confirmed during a press conference Wednesday afternoon.

The guns were purchased legally.

-ABC News' Josh Margolin, Aaron Katersky, Laura Romero and Olivia Rubin