Police on Long Island said that “violence will not be tolerated” ahead of a rally for Republican presidential candidate Donald Trump .

Nassau County Police Commissioner Thomas Krumpter said that his department will be ready for the more than 10,000 supporters and protesters who could appear at the rally at Grumman Studios in Bethpage on Wednesday evening.

“Trump’s campaign is a bit of an anomaly for law enforcement,” Krumpter said, adding that the tone, size and dynamic of the events all have to be accounted for by police.

Krumpter’s announcement comes after a rally for Trump in Chicago on March 11 devolved into chaos. Other rallies have featured sometimes literal sparring matches between Trump supporters and protesters.

Streets around the rally site will be closed ahead of the rally Wednesday afternoon, and metal detectors will be set up around the event space, Krumpter said. Guns and bags will be barred from the event.

Krumpter said that the event will likely cost the department between $300,000 and $400,000 in overtime and other costs. The Trump campaign is not expected to foot the bill.