State Department urges citizens to maintain high level of vigilance and 'practice good situational awareness' while abroad

Critics on right and left see last year's US withdrawal from Kabul as a show of ineptitude that will make Afghanistan a hotbed of anti-American Islamic groups

Washington and Taliban trade accusations of violating 2020 Doha Agreement on US pullout; Blinken says al-Zawahiri's presence breaks Kabul's commitment to not harbor terrorists

2 missiles hit home of terror chief without sign of blast and Washington says no one else was injured -- suggesting use of Hellfire R9X, said to dice targets with 6 large blades

US officials built a scale model of the safe house where Ayman al-Zawahiri had been located, aiming a tailored airstrike at the home's balcony where they learned he enjoyed sitting

Slain terror chief was crucial in shifting jihadi movement to target US; 9/11 made Bin Laden American enemy No. 1, but attacks likely wouldn't have succeeded without his deputy

President says US operation delivered justice for families of 9/11 victims; senior US official says safe house used by Ayman al-Zawahiri owned by Taliban leader's aide

White House officials confirm successful counterterrorism operation, says there were no civilian casualties; US ground team has since pulled out, senior intelligence official says

US military says it's 'highly confident' it killed insurgent, who was hit while alone on motorcycle, in second operation this month against senior terror figures in Syria

Department of Homeland Security cites January standoff at a synagogue in Texas linked to al-Qaeda supporter -- but stresses that greatest threat stems from domestic terrorism