BETHEL PARK, Pa. (AP) — Three days after the attempted assassination of Donald Trump, the 20-year-old man who came close to killing the former president remains an enigma. Neighbors describe Thomas Matthew Crooks as an intelligent loner with few friends who left a vanishingly thin social media footprint and no hint of strong political beliefs. Even his cellphone bore few clues after the FBI accessed its contents, frustrating investigators’ efforts to identify a potential motive. Classmates at Bethel Park High School said Crooks was smart but standoffish, often seen wearing headphones and preferring to sit alone at lunch looking at his phone.