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

Six people injured in the Texas elementary school shooting remain hospitalized on Wednesday.

Three children and one adult are at the University Hospital in San Antonio, two of whom are in serious condition.

Two other adults are hospitalized at Brooke Army Medical Center, both in serious condition.

All patients treated at Uvalde Medical Center have been discharged. The hospital said it treated 15 individuals, 11 of whom were children. Three of those 11 children were transferred to other hospitals in San Antonio and eight were discharged home.

The four remaining patients were adults, one was transferred to another hospital and three were discharged home.

-ABC News' Jennifer Watts

Jacinto Cazares, the father of Jacklyn Jaylen Cazares, a 10-year-old killed in the Texas elementary school shooting, told ABC News he blames the school and police for the massacre, not the murder weapons.

"I want to say we hold the school responsible for not having locked doors and no protocol, no training. Also the Police for not having a better and faster tactical response time. There was at least 40 lawmen armed to the teeth, but didn't do a darn thing till it was far too late," Cazares told ABC News in a statement.

He added, "The situation could've been over quick if they had better tactical training and we as a community witnessed it first hand. I'm a gun owner and I do not blame the weapons used in this tragedy. I'm angry how easy it is to get one and young you can be to purchase one."

-ABC News' Miles Cohen

Secretary of Homeland Security Alejandro Mayorkas said the department is "horrified by this callous act of violence," in a statement Wednesday.

Mayorkas said one Border Patrol agent was injured in the crossfire.

"We are grateful for the courageous members of our Border Patrol, many of whom are part of the Uvalde and surrounding communities, who immediately responded to the scene along with local and state law enforcement," Mayorkas said.

He added, "Without hesitation, they put themselves between the shooter and students to end the bloodshed and administer medical aid. Without question, their heroism yesterday saved lives."

The department will continue to coordinate with local, state and federal partners, Mayorkas said.

"As we pray for the families and loved ones and recognize the bravery of frontline law enforcement personnel, we must redouble our collective efforts to make our communities safer," Mayorkas said.

Texas state Sen. Roland Gutierrez called on lawmakers to act on gun control, specifically calling on them to look into an assault weapons ban at the federal level, in an interview on ABC News Live Wednesday.

"We have to make sure that we're creating laws in the state of Texas, as well as at the federal level, so that we can stop access to these types of militarized weapons," Gutierrez said on ABC News Live.

"I know my district -- there's nobody in this district that goes hunting with an AR-15," Gutierrez said, referring to the assault weapon the alleged shooter had purchased two days before the shooting.

Gutierrez called on the U.S. Senate to break the filibuster and pass legislation in order to stop seeing "these types of militarized weapons."

"We have young, confused men, young men violating lives across this country and violating families across this country."

8:17

Sen. Gutierrez talks about the deadly school shooting in Uvalde, Texas

Texas state Sen. Roland Gutierrez, who represents the district where the shooting took place, shares what action he would like to see from the federal government after the deadly incident.

He added, "It is high time that we do something. My heart goes out to the people in my community here in the valley, but we've got to take that to another level and do something now. Because if we can't do something, then what are we? What are we sending people off to Washington for? What are we sending people up to Austin for? We've got to do more."