Federal authorities say they disrupted a plot to attack last Sundays UFC event on the White House lawn.Officials said investigators learned of the threat on June 10, four days before the event, which drew President Donald Trump, other government officials and thousands of invited guests. Additional UFC fans watched the fights on large screens on the National Mall.PREVIOUS REPORTING | Judge denies request to halt UFC event on White House groundsFive men have been charged in connection with the alleged plot, including conspiracy to commit murder and conspiracy to commit violence on White House grounds. The Justice Department identified the men as Tycen C. Proper, 19, of Danville, Ohio; Bryan Omar Roa, 24, of Calimesa, California; Michael Alan Thomas, 32, of Pinon Hills, California; Daniel K. Eskridge, 32, of Kidder, Missouri; and Abraham Hermosillo Alvarez, 31, of Omaha, Nebraska.The investigation began after Proper's mother alerted authorities about her son's recent behavior, including firearms purchases and communications with people he met online. Court documents say Proper later admitted to investigators that he had helped plan the attack, which allegedly involved drones carrying explosives and gunmen targeting attendees and other "high-value targets."PREVIOUS REPORTING | UFC fighters descend on Lincoln Memorial ahead of White House boutsProsecutors also allege the group, which communicated on encrypted apps, selected some targets based on a belief that certain lawmakers had accepted money from pro-Israel lobbying organizations.Officials said they spent months preparing the White House complex to convert the lawn into a secure venue for the televised UFC fights. Legal filings show those efforts cost $60 million.The FBI, our law enforcement partners and our U.S. Attorneys did what they do every day to make America Safe through quick response and vigilance in investigating, disrupting, and dismantling this alleged plan before it could be carried out, said Acting Attorney General Todd Blanche. ...read more read less