Shawn Boburg

• Investigations

A troubled 15-year-old in rural Texas was shunned as an outcast in his community. He found refuge on social media, where he became the anonymous leader of a global online group that preyed on vulnerable children.

• National

“im committing a mass shooting, and im waiting a good 2-3 years,” a user wrote in a Discord chatroom.

• National

Body-cam footage released Thursday shows local police searching for Thomas Matthew Crooks in the moments before he opened fire.

• Elections

The Harris-Walz campaign has cited his military experience as an asset. But Republicans and some who served with him have questioned claims about his service.

• Investigations

A disjointed communications system on the day of the rally hampered the Secret Service’s ability to grasp the threat in real time, a Post examination found.

• Visual Forensics

Thomas Matthew Crooks temporarily recoiled from his rooftop perch and did not shoot again before he was killed by a Secret Service countersniper.

• National

The Washington Post reported in a video analysis Monday that bystanders at the Trump rally in Butler, Pa., warned local police that they had seen a man clambering onto the roof of the building.

• Investigations

A Post analysis of the video backs up reports from other witnesses, who have said they tried to alert police in the moments before shots rang out.

• Investigations

A global network of online groups has targeted thousands of children with a sadistic form of social media terror that authorities and technology companies have struggled to control, an examination finds.