Authorities say a man is in a standoff with law enforcement and has "unknown injuries" after he tried to breach the FBI's Cincinnati office, fled and exchanged gunfire with law enforcement. The Ohio State Highway Patrol said Thursday that no one else was hurt. Officials say the man was wearing body armor and was chased onto Interstate 71. Officials say the man abandoned his car on nearby roads, where he exchanged gunfire with police and remains in a standoff. The episode came a day after the FBI director warned against threats circulating online against agents and the Justice Department following the agency's search of former President Donald Trump's Mar-a-Lago home.