SEOUL, South Korea — North Korea said Aug. 24 its second attempt to launch a spy satellite ended in failure due to an “error in the emergency blasting system” during the third-stage flight. The failed launch came about three months after the nation’s first attempt failed in May, when the new carrier rocket Chollima-1 crashed into the sea soon after liftoff. North Korea called the error “not a big issue in the aspect of the reliability of cascade engines and the system,” vowing to make another attempt in October, according to the North’s state-run Korean Central News Agency (KCNA). The...