South Korean army opens fire after North Korean soldiers cross border

South Korea's military fired warning shots after North Korean soldiers crossed the rivals' tense border on Tuesday, South Korean officials said, the first known border intrusion by North Korea in nearly a year. According to Assosicted Press violent confrontations and bloodshed have occasionally happened at the Koreas' heavily fortified border, called the Demilitarized Zone. But Tuesday's incident won't likely escalate, as it didn't cause any casualties on either side and North Korea hasn't returned fire.