Update: Explosives were found at the high school and the surrounding area, according to Chief Walter Braun of Santa Fe Independent School District Police.
Update #2: Multiple media outlets identified the suspect as 17-year-old Dimitrios Pagourtzis, citing police sources. Witnesses said the suspect was known to wear trench coats every day, which included neo-Nazi, communist hammer & sickle and Baphomet pins. Pagourtzis claimed to be an “atheist” on Facebook, yet he also predominantly featured a pentagram on his profile page.
Update #3: An earlier version of this report stated that 12 were reported dead and 12 injured, but Texas Gov. Greg Abbott has so far confirmed 10 dead and 10 injured. This article has been modified to reflect that revised figure.