A gunman who shot and wounded two kindergarten students at a private school in northern California on Wednesday left behind a note revealing the shooting was motivated by his opposition to “America’s involvement with genocide and oppression of Palestinians.”

The shooter — who authorities identified as Glenn Litton, 56 — opened fire in the playground of the Feather River School of Seventh-Day Adventists in the town of Oroville, injuring two children. Roman Mendez, 6, and Elias Wolford, 5, are in critical condition and will likely need surgery, according to police.

Litton was pronounced dead at the Oroville school shortly after the shooting. Authorities said the cause of death was most likely a self-inflicted gunshot wound.

On Thursday, law enforcement said that Litton had a long criminal history and suffered from mental health issues. Police also revealed disturbing writings believed to be from Litton which provided insight into the shooters motives.

One note indicated that opposition to US support for Israel’s defensive military operations against the Palestinian terrorist group Hamas in Gaza was a motivation for the shooting.

“Countermeasure involving child executions has now been imposed at the Seventh Day Adventist school in California, United States by The International Alliance,” the note read. “I, Lieutenant Glenn Litton of the Alliance carried out countermeasure in necessitated response to America’s involvement with Genocide and Oppression of Palestinians along with attacks towards Yemen.”

Litton reportedly gained access to the Feather River’s campus by securing a meeting with its principal to discuss enrolling a nonexistent grandson. He used a fake name. Having avoided arousing suspicion, Litton followed the meeting by walking to the playground, where he opened fire.

“The Seventh-day Adventist Church in North America is profoundly saddened following the shooting at the Feather River Seventh-day Adventist School on December 4,” the North American Division of the Seventh Day Adventist Church said in a statement. “We pray for the entire school family and community as they grapple with this senseless violence. We ask that all people, no matter their faith, join us in prayer for everyone affected.”

It continued, “All levels of ministry are engaged in supporting members of our church and others in the community who are in crisis. We also wish to express our gratitude to the first responders, and for the competence and compassion of the local sheriff — who will lead a press conference with other local leaders this afternoon — and his team. We anticipate updates to continue to come from this official channel.”

Litton indicated that he considered committing violent attacks before, according to local CBS affiliate KOVR. In 2002, a law enforcement search of his home uncovered a “bulletproof vest and parts for a stun gun.” On his computer, they reportedly found that he had queried search engines for purchasing “guns and explosives” and written notes outlining a rough plan for a “mass incident with explosives.” Despite this incident and many others, Litton was repeatedly put back on the streets. He was arraigned on burglary charges just last month, according to the New York Post but granted his freedom after pleading not guilty.

“Our hearts go out to the students, staff, and families of the Feather River Adventist School,” Oroville Mayor David Pittman said in a statement. “Our thoughts and prayers are with the two young boys who have been physically injured in this nightmare. The entire staff, students, and families have also been emotionally traumatized after this incident. Sadly, our schools must plan and train for these kinds of events and pray they never occur.”

He continued, “Our schools must be safe places. To the Feather River Adventist School staff, you and your students have suffered unimaginable trauma today. We, as a community, are here to support you through your healing. We thank you for your response after this incident and thank all first responders and agencies.”

Follow Dion J. Pierre @DionJPierre.

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