A former FBI special agent is calling on Americans to use caution when attending major national events after two deadly incidents happened back-to-back on New Year's Day. "Sadly, we're going to continue to see these types of events occurring, whether they are ISIS-inspired or radical Islamic terrorist events or if they're mass shootings or if they're the CEO of UnitedHealthcare individual that just has lost his mind," Nicole Parker, former FBI special agent and Fox News Contributor explained to Fox News Digital. "With a lot of these events coming up, there's just a lot of activity that's going to be happening