US troops surge evacuations out of Kabul but threats persist

In this Aug. 22 photo provided by the U.S. Air Force, Afghan passengers board a U.S. Air Force C-17 Globemaster III during the Afghanistan evacuation at Hamid Karzai International Airport in Kabul, Afghanistan. (MSgt. Donald R. Allen/U.S. Air Force via AP)

WASHINGTON — The U.S. military pulled off its biggest day of evacuation flights out of Afghanistan by far on Monday, but deadly violence that has blocked many desperate evacuees from entering Kabul’s airport persisted, and the Taliban signaled they might soon seek to shut down the airlifts.