As UFC fans descend on Washington, D.C., for Freedom 250 on Sunday and events surrounding it, security will be strict, according to the top Secret Service agent for D.C.

President Donald Trump announced Monday that the UFC will construct a 4,500-seat venue for the event, one of many marking the U.S.’s 250th birthday.

Everything fight fans need to know about the events taking place during UFC Freedom 250 fight week in Washington D.C.

U.S. Secret Service officials said hundreds of drones and tactical teams will be deployed, along with “unseen resources.”