France has detained seven former members of far-left Italian militant groups, including the Red Brigades, APA reports citing BBC.
The seven, and three other Italians still being sought, had been convicted of terrorism charges in Italy dating back to the 1970s and 1980s.
France had offered left-wing radicals protection from extradition under a controversial policy.
Italy's prime minister welcomed the arrests, saying the crimes had "left a wound that is still open".
The Red Brigades and other militant groups carried out violence in Italy during the so-called Years of Lead.
The period, from the late 1960s to early 1980s, got its name from the vast number of bullets fired.
The Red Brigades were blamed for numerous killings, including the 1978 abduction and murder of former prime minister Aldo Moro.