美国再发生移民执法人员枪杀公民事件，德国总理：“属实令人震惊”，应彻查

Group 1 - The core viewpoint of the article is that German Chancellor Merz expressed shock over the shooting of American citizen Alex Preti by law enforcement in Minneapolis, calling for a swift and thorough investigation by the U.S. [1][3] - Merz emphasized the need for U.S. authorities to investigate whether the shooting was justified and if the law enforcement officers felt threatened [3] - The incident has raised concerns about the level of violence in the U.S., with Merz stating that such events are alarming [3][4] Group 2 - The shooting occurred during an immigration enforcement operation by federal agents, resulting in the death of 37-year-old Alex Preti, a nurse at a veterans hospital [3] - Following the incident, a federal judge issued a temporary restraining order to prevent federal agencies from destroying evidence related to the case [3] - This incident is part of a broader pattern of violence involving federal law enforcement, as another American citizen, Raina Nicole Good, was also shot and killed during a similar operation earlier in the month, leading to protests against violent enforcement [3]