KABUL, Afghanistan—The Taliban said that a U.S. airstrike targeted a suicide bomber in a vehicle Sunday who wanted to attack the Kabul international airport amid the American military’s evacuation there. There were few initial details about the incident, as well as a rocket that struck a neighborhood just northwest of the airport, killing a child. The two strikes initially appeared to be separate incidents, though information on both remained scarce. The attack comes as the United States winds down a historic airlift that saw tens of thousands evacuated from Kabul’s international airport, the scene of much of the chaos that engulfed the Afghan capital since the Taliban took over two weeks ago. After an Islamic State affiliate’s suicide attack that killed over 180 people, the Taliban increased its security around the airfield as Britain ended its evacuation flights Saturday. U.S. military cargo planes continued their runs into the airport Sunday, …