A gunman killed at least 19 children and 2 adults at a Texas elementary school

The number of people confirmed killed in a school shooting in Uvalde, Texas, has risen to 21, according to The Associated Press.

The dead included 19 children and two adults, Travis Considine, a spokesman for the Texas Department of Public Safety

Local and state authorities offered no names or descriptions of the two adults, but Gov. Greg Abbott said one of the two adults was a teacher.

Earlier, Sgt. Erick Estrada of the Texas Department of Public Safety told CNN that the shooter is also deceased

Estrada also offered new details about the events leading up to the horrific slaughter at Robb Elementary School, about 85 miles south of San Antonio.

According to calls to law enforcement beginning at around 11:20 a.m. local time, the gunman,

who has been identified as an 18-year-old male resident of Uvalde, shot his grandmother at her home before heading toward the school in a large

Callers told law enforcement that he was seen exiting the truck carrying "some sort of rifle," a backpack, and wearing body armor

The gunman made his way into the school building through a south facing door and began shooting, Estrada said.

U.S. Border Patrol agents were among the law enforcement who responded, exchanging gunfire with the gunman who had barricaded himself inside

Department of Homeland Security spokesperson said. At least one Border Patrol agent was wounded.

The school enrolls about 600 students in second, third and fourth grades. At least one of the adult victims was a teacher at Robb Elementary

Thursday was meant to be the last day of the school year, according to the school's website.

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