Robb Elementary teaches second, third and fourth grade students in Uvalde, which is about 85 miles west of San Antonio. Gov. Greg Abbott said the shooter is believed to have been killed by responding law enforcement. 

The shooting started around 11:32 a.m. Nineteen children and two adults were killed in a shooting at Robb Elementary School in Uvalde County on Tuesday, making the massacre the deadliest school shooting in Texas’ history.

“My heart is broken today,” Uvalde Consolidated Independent School District Superintendent Hal Harrell said while holding back tears during a press conference Tuesday evening. 

Gov. Greg Abbott said the shooter was killed. The shooter is believed to have acted alone, said Pete Arredondo, Uvalde CISD chief of police.

President Joe Biden has spoken with Abbott to offer his assistance, White House officials said. Biden also ordered flags on all public property and at U.S. embassies to be flown at half-staff in memory of those killed.

The gunman shot his grandmother before the shooting at the school, Gutierrez told CNN. The grandmother was airlifted to San Antonio and was “still holding on” Tuesday evening, according to information given to Gutierrez by the Texas Rangers.

The Daily Dot reported the shooter had bought a rifle online recently. He posted images of two rifles in his most recent post on Instagram before the social media platform deleted the account, according to the outlet.

Earlier Tuesday, the Uvalde CISD had placed all campuses under lockdown after gunshots were fired in the area.

Harrell said the school will be closed for the remainder of the academic year, though grief counseling will be offered to students.