The man, 31-year-old Anton Caluori, sent a threatening email to a general FBI mailbox, said Emily Langlie with the U.S. Attorney's Office. Secret Service agents immediately went to Caluori's apartment at the Panther Ridge Apartments Complex, found he was armed and took him into custody, Langlie said.
"When they opened the door he was armed. And then they obviously got him into custody and arrested him," said Tanya Waller, who witnessed the arrest.
Federal agents said they found suspicious items in the Caluori's unit and out of an abundance of caution, called in a bomb unit to sweep for any possible explosive devices. Two weapons were also confiscated, Federal Way police said.
Lee Hauser, who also lives in the complex in the 100 block of S. 334th Street, says the entire complex was evacuated. He added he could see police cars, a black sedan and a bomb disposal unit at the scene.
Cathy Schrock of the Federal Way Police Department said the evacuation was necessary to ensure the safety of all individuals in the area.
"We know folks want to reenter, but we must ensure it is safe for citizens and follow up investigators," Schrock said.
Caluori's mother, Renee, said her son made a mistake.
"He has a good education, he's a good boy, but he's done a stupid thing," she said. "I don't know a whole lot. How would you feel if your son got arrested? Never got arrested, was in the military, has a college education. And I'm just a little bit upset and shocked."
Langlie said Caluori will make is first appearance in federal court Wednesday afternoon. Federal officials did not give any further details about the threat they received.