Why was the killer exchanging gunfire with Border Patrol Agents? Running drugs?

Ace reports on the horrendous killings today in Texas.

14 Elementary School Students and One Teacher Dead in School Shooting Spree In Texas Shooter Exchanged Gunfire With Border Patrol Agents Before Barricading Himself Inside School, But Was US Citizen

Read more here: https://acecomments.mu.nu/?post=399271

General Dispatch updates our knowledge: 18 children and one teacher were killed.

May 24, 2022: The death toll is now 19 students and two teachers.