Texas saw its deadliest school shooting in modern state history Tuesday as details begin to emerge after an alleged gunman reportedly killed at least 19 children and two teachers at an elementary school in Uvalde, Texas.

During a news conference, Texas Gov. Greg Abbott identified the assailant as Salvador Ramos, 18, and said he was a resident of the heavily Latino community about 85 miles west of San Antonio. The governor said Ramos walked into Robb Elementary School in Uvalde around 11:30 a.m. Central time and opened fire.

USA TODAY has decided not to show an image of the suspect but is providing general details about the alleged shooter to inform how mass attacks are often planned and carried out, particularly with respect to how weapons and targets are selected. These details give authorities and the public information that could help citizens spot future mass shooters and even prevent them.

Tuesday’s massacre was the deadliest shooting at a U.S. grade-school since a gunman killed 20 children and six adults at Sandy Hook Elementary in Newtown, Connecticut, almost a decade ago. The Texas shooting comes just 10 days after a gunman in body armor killed 10 Black shoppers and workers at a supermarket in Buffalo, New York, in what authorities say was a racist attack.

Here’s what we know about Tuesday’s deadly shooting:

BLOODSHED SINCE SANDY HOOK:Uvalde school shooting among deadliest school attacks in past 10 years

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Alleged gunman ‘Reported to have been a student’ at local high school

The alleged attacker was “reported to have been a student” at Uvalde High School, Abbott said at the news conference Tuesday.

The high school, part of the same school district as Robb Elementary where the shooting took place, enrolls about 1,100 students, according to the school district. 91% of students in the district are Hispanic, and almost 80% are economically disadvantaged, the district said.