Federal agents seized computers, papers, books and electronic equipment from the home of a former Los Alamos National Laboratory nuclear scientist, who last year sought to work on a fusion project with Venezuela but believes the U.S. government is wrongly targeting him as a spy. P. Leonardo Mascheroni said in a telephone interview Wednesday from his home that four FBI agents searched his home for 13 hours Monday. The agents, he said, led him to believe they were investigating him for espionage. “I am not a spy,” Mascheroni said. “If I were a spy, a long time ago I would have gone away from the United States with all my knowledge. Instead, I stay in my house all the time and am working all the time and presenting all the time to Congress. Is that what a spy does?” FBI spokesman Darrin Jones confirmed the agency is pursuing an “ongoing investigation” in Los Alamos, but declined further comment Wednesday. No charges have been filed against Mascheroni.