A number of American suspects in high-profile cases have not been brought to justice , say Italians . Score: 6 In 2009 , American troops opened fire at a Baghdad checkpoint , killing Italian secret service agent Nicola Calipari . The trial of Seattle student Amanda Knox , accused of killing her British roommate Meredith Kercher is also controversial .
A number of American suspects in high-profile cases have not been brought to justice , say Italians . In 1998 , 20 people were killed when a U.S. Marine Corps jet sliced through steel wires supporting a cable car in the Italian Alps . In 2009 , American troops opened fire at a Baghdad checkpoint , killing Italian secret service agent Nicola Calipari . The trial of Seattle student Amanda Knox , accused of killing her British roommate Meredith Kercher is also controversial .