On this day in conspiracies

The kidnapping plan collapses when Lincoln changes his schedule. The plot stalls, and in Booth's hands it later mutates from abduction to murder.

The kidnapping attempt fails when Lincoln changes his plans and never appears on the expected route. The cell begins to fracture, and some members pull back.

Milanese magistrates investigating the banker Michele Sindona order a search of Gelli's Villa Wanda near Arezzo. In his safe they find a membership list of roughly 962 names, along with dossiers and documents.

Followers gather at Kanungu for what was described as a celebration, with food and crates of soft drinks. Villagers then hear an explosion, and the church building is consumed by an intense fire that kills the hundreds inside; witnesses and investigators reported that the doors and windows had been secured from the outside so that no one could escape. Contemporary estimates of the dead ranged from several hundred to more than five hundred, including scores of children.

The Observer and the Guardian, alongside The New York Times, publish the full exposé built on documents and testimony from former employee Christopher Wylie. The reporting details the scale of the harvest and the firm's methods, and the term 'Cambridge Analytica' becomes global shorthand for data misuse.

Iran's Civil Aviation Organisation releases its final safety report, attributing the launch to a mobile air-defence unit whose radar was misaligned by roughly 105 degrees after relocation, and to an operator who fired without receiving authorization from the coordination centre.

Opposition figures and rights groups allege an LRAD or similar acoustic weapon was fired at the crowd, a use that would be unlawful in Serbia. Calls mount for an independent investigation.

Trump asserts on social media that Biden's pardons of the January 6 committee are 'void' and 'vacant' because 'they were done by Autopen.' PolitiFact and other fact-checkers rate the legal claim False, noting the Constitution requires no handwritten signature.