Here’s what we know and don’t know about the alleged terror plot thwarted by FBI in Michigan

By Holly Yan, Ray Sanchez, Leigh Waldman and Jeff Winter, CNN (CNN) — A cryptic reference to “pumpkin day.” An online chat about an ISIS-inspired attack. A shooting range visit to practice high-speed reloads with AK-47s. A potential terrorist attack over Halloween weekend was thwarted by the FBI, according to a social media post by