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   It's one of the biggest parades of the year in St. Louis.   The 125th annual Annie Malone May Day Parade will march through downtown Sunday afternoon.

   In light of recent violence at a New Orleans parade and the Boston Marathon bombing, St. Louis police are adjusting their security plan.  Police Chief Sam Dotson says the plan includes both plain clothed and uniformed officers and communications with FBI and state law enforcement officers.

   "It includes an intelligence component," Dotson said.  "Are there any threats against the parade? And the first answer to that is no, there aren't."

   Dotson says parade goers can play a role in keeping the event safe by leaving their guns at home, and paying attention to their surroundings.   Dotson says police will be very visible along the parade route Sunday and if parade-goers see someone acting strangely, like wearing a long coat or a trench coat that's inappropriate for the weather, they should point that individual out to an officer.

   Parade organizers say they've also contracted private security for the event.