N. Korea marks military anniversary with firing drill

Nuclear-armed North Korea on Tuesday marked a military anniversary with a massive conventional firing drill, Seoul said, as a US guided-missile submarine docked in South Korea amid tensions over Pyongyang's weapons ambitions.Speculation had mounted that the North could carry out a sixth nuclear test or another missile launch to mark 85 years since the founding of its army.The South's Yonhap news agency cited a government source as saying the exercise was the North's "largest ever" and was presum