* Four arrested on suspicion of plotting attack on G8 summit * Suspects believed to be attempting to rebuild Red Brigades (Adds interior minister, details) ROME, June 11 (Reuters) - Italian police have arrested four people suspected of plotting an attack on July's heads of state summit of the G8 group of industrialised nations, officials said on Thursday. Interior Minister Roberto Maroni said the suspects had been trying to relaunch "the armed struggle in Italy" by rebuilding the communist-inspired Red Brigades, which kidnapped and assassinated public figures in a bloody campaign in the 1970s and 1980s. "The people arrested, in fact, were about to rebuild the operational structure of the Red Brigades, ready to make an extraordinary strike," Maroni said. Police said the four men were arrested on charges relating to membership of an armed group. A fifth person was detained, but has yet to be formally charged, and 15 others were under investigation, the sources said. Police also confiscated three pistols, a hand grenade, machine guns and electronic devices in their investigations. Among three suspects arrested in Rome was Luigi Fallico, 57, identified as the head of the group and a friend of a former leader of the "new Red Brigades", Nadia Desdemona Lioce. Lioce was arrested in clashes with police on a train in 2003 in which her companion was killed. "A member of the Red Brigade never retires. He dies a member of the Red Brigade," Fallico said during a wire-tapped telephone conversation, the police sources said. Intercepted phone calls dating back to January revealed plans to attack the G8 meeting, which was then due to be held on the Mediterranean island of La Magdalena. The July 8-10 summit has since been moved to the city of L'Aquila, which was badly damaged in the earthquake that shook the central region of Abruzzo in April, leaving some 60,000 people homeless. Prime Minister Silvio Berlusconi moved it to focus attention and government resources on the aftermath of the disaster. The fourth man arrested, 39-year-old Riccardo Porcile of Genoa, was found to possession of a machine gun, a hand grenade and explosives. (Reporting by Daniele Mari and Daniel Flynn, Editing by Lin Noueihed)
