<h1>Political violence prompts forensic probe after rifle found and FBI releases person-of-interest photos seeking public tips</h1> A targeted fatal shooting at a university campus produced a recovered Mauser .30 caliber bolt-action rifle concealed in nearby woods; the weapon, containing a spent cartridge and additional rounds, is under federal forensic analysis while investigators review campus video, release photos of a person of interest, canvass the neighborhood, and appeal to the public for information as they trace the shooter's movements.