By Sarah N. Lynch WASHINGTON (Reuters) -The number of murders reported in the United States rose last year, the FBI said on Wednesday, but it warned that a change in its data collection methods meant that its tally excluded the nation’s two largest cities, New York and Los Angeles. The bureau said its data suggested the number of murders reported in the United States rose by 4.3% since 2020, with the vast majority of those homicides committed using some type of firearm. The increase follows a 29.4% surge in the murder rate the year before. Although the new report shows that overall violent cri…