美國與以色列近日對伊朗發動聯合軍事行動，而伊朗最高領袖哈米尼（Ayatollah Ali Khamenei）遭擊斃，引發區域局勢急遽升溫。美國聯邦調查局（FBI）與國土安全部（DHS）隨即提升至戰時警備狀態，加強本土反恐部署，嚴防伊朗或其代理勢力發動報復行動。
FBI personnel are fully engaged on the situation overseas. Last night I instructed our Counterterrorism and intelligence teams to be on high alert and mobilize all assisting security assets needed. Our JTTFs throughout the country are working 24/7, as always, to address and…
— FBI Director Kash Patel (@FBIDirectorKash) February 28, 2026
根據外媒報導，FBI局長Kash Patel表示，全美兩百多個聯合反恐任務小組已全天候運作，首都華盛頓與紐約等地的重要交通與宗教場所也增加警力巡邏。前FBI官員指出，獲伊朗支持的真主黨與哈瑪斯長年經營海外網絡，潛在風險不可低估。曾任聯邦調查局助理局長的史威克（Chris Swecker）警告，若潛伏人員意圖行動，「當下正是敏感時刻」。他並提到，近年邊境管理爭議，使部分安全專家憂心滲透風險升溫。
在全國高度戒備之際，奧斯汀（Austin）市中心娛樂區發生重大槍擊案。一名53歲男子在第六街一帶持槍朝人群射擊，造成2死14傷，隨後遭警方擊斃。據《The Washington Post》報導，嫌犯身穿印有宗教標語的服飾，車內發現《古蘭經》，FBI已介入調查是否涉及極端主義動機。
Today, the U.S. has designated Iran as a State Sponsor of Wrongful Detention. The #FBI remains committed to working with our federal and international partners to return Americans who are being held captive home and bring their captors to justice. The Hostage Recovery Fusion Cell… pic.twitter.com/fRCnyXutsA
— FBI (@FBI) February 27, 2026
初步顯示，嫌犯為歸化美國公民，未列入反恐監控名單，是否受中東衝突刺激仍待釐清。白宮表示總統川普已聽取簡報；而德州州長則宣布強化州內維安。
We extend our deepest condolences to the families and loved ones of those who lost their lives in this tragic incident and thank the Austin Police Department for their swift response in addressing the threat. The FBI responded alongside the Austin Police Department to the… pic.twitter.com/gsfNeya8pS
— FBI San Antonio (@FBISanAntonio) March 1, 2026
此外，伊朗總統裴澤斯基安（Masoud Pezeshkian）揚言報復。專家指出，伊朗多年來持續發展海外行動能力。自2020年伊朗將領卡西姆·蘇雷曼尼（Qasem Soleimani）遭美軍擊斃後，美方已挫敗多起相關陰謀。面對緊張升高的局勢，美國安全部門持續嚴陣以待。
