Authorities seized multiple pieces of evidence from the Mesquite home of Dallas police shootings suspect Micah Xavier Johnson.
Johnson, a 25-year-old Army veteran who served in Afghanistan, is suspected of killing five and wounding seven police officers and two civilians during a peaceful July 7 Black Lives Matter protest in Dallas.
Upon searching Johnson’s home, ATF and police investigators found bomb-making materials, rifles, ammunition, ballistic vets and a personal journal of combat tactics, WFAA reports.
Police ascertained Johnson acted alone in the sniper-style shooting. He was not affiliated with any groups.
Three years ago, Johnson was connected to the New Black Panther Party, but was kicked out after a few months.
The Party’s Houston leader, Quanell X, said Johnson had violent ideas. He told the leadership to distance themselves from Johnson.
During a 45-minute standoff following the shootings, Johnson told police he wanted to kill white people, especially white police officers.
Johnson was killed by a bomb-carrying robot after negotiations fell through and he exchanged gunfire with officers, Reuters reports.
The murder of the five police officers is the highest death toll for U.S. police in the line of duty from a single event since the September 11 terrorist attacks.
Police departments across the country, including New York City, New York, Chicago, Illinois and St. Louis, Missouri, responded to the shootings by requiring officers to work in pairs.