The 20-year-old gunman who tried to assassinate former President Donald J. Trump at a rally in Pennsylvania appears to have acted alone, F.B.I. officials said on Sunday... But they said it was not clear whether the father gave his son the weapon or whether he took it without permission.
Dozens of federal investigators scrambled to determine why the gunman, Thomas Matthew Crooks of Bethel Park, Pa., climbed atop a nearby building and squeezed off a volley of shots on Saturday evening that injured Mr. Trump, killed a man attending the rally with his family and left two other people at the site critically injured before he was killed by a Secret Service sniper.
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