An American soldier is detained by North Korea after crossing its heavily armed border

SEOUL, South Korea (AP) — An American soldier crossed the heavily armed border from South Korea into North Korea, U.S. officials said Tuesday. He went "willfully and without authorization," the U.S. military said, becoming the first American detained in the North in nearly five years at a time of heightened tensions over its nuclear program. There were no immediate details about why or how the soldier crossed the border or whether he was on duty. The five U.S. officials spoke on the condition of anonymity to discuss the matter ahead of a public announcement. The American-led U.N. Command overseeing the…