User @Kris_Mexicanese tweeted: "What if what happened in Boston at that marathon happened also at the miami heat parade ? That'd be soo cool." He sent another saying: "Boston is gonna occur again so I've heard ? RT @wsvn: Championship parade Monday at 11:00 a.m."
He later tweeted another user, indicating he was joking, saying: "This was almost funny ... Just ALMOST LOL IT'S TWITTER relax lmao it's jokes."
The FBI, Miami Police Department, and Florida Department of Law Enforcement are investigating.
Anyone with information on the incident is asked to call the FBI at 305-944-9101.