As South Koreans head to the polls for a parliamentary election, the country's worsening ties with North Korea are high on the agenda. The small South Korean island of Yeonpyeong is located about 12 kilometres from the North Korean coast. In January, Pyongyang fired live artillery into nearby waters, forcing islanders into air raid shelters. The island could be first in the line of fire if conflict breaks out between the North and South.