OKLAHOMA CITY (AP) — A 23-year-old man who was "out for blood" when he attempted to detonate what he believed was an explosives-laden van outside an Oklahoma bank in a plot similar to the deadly 1995 bombing of the Oklahoma City federal building, authorities said Monday.

During a meeting with undercover FBI agents in June, Jerry Drake Varnell of Sayre, Oklahoma, said he held "III% ideology" and wanted "to start the next revolution," a reference to the "Three Percenters" patriot movement — begun in 2008, galvanized by President Barack Obama's election — and that has rallied against gun control...