NEW YORK - Federal agents in Washington state have arrested an armed man accused of making threats against President Barack Obama, according to US media reports. US Secret Service agents and local law enforcement officers knocked on the door of Anton Caluori, 31, in Federal Way, Washington State, on Tuesday afternoon, Secret Service spokesman Brian Leary said. Caluori came to door with a shotgun, but was taken into custody without injury, Leary added, though Caluori made references to explosives, prompting a call to the bomb squad.