Law enforcement authorities are already dealing with security threats related to the Republican National Convention.

Even in Pinellas County.

On Thursday, St. Petersburg police arrested two suspected protesters who were reportedly seen playing with a BB gun on top of a downtown parking garage.

They were the first convention-related arrests in St. Petersburg, which will host a big RNC kickoff party Sunday night at Tropicana Field.

According to the Tampa Bay Times, police said they received a call late Thursday from a citizen who had seen people playing with some type of gun on the roof of a parking garage at 100 Second Ave. S.

Officers were dispatched to the scene and found two men and a female teen runaway hanging out.

They also found several items indicating they were protesters, including anti-government T-shirts and a backpack stuffed with a large machete, a pocketknife, tin snips and a pry tool, police told the Times.

Trevor Swanson, 19, of St. Petersburg and Kyle Shaw, 21, were arrested. Police said Shaw had a BB gun in his waistband.

Days earlier, police were called to a downtown Tampa building after someone found bricks, a pipe and protest-related graffiti on the rooftop.