The four-lane bridge was completed in 2014 but remained unused for 12 years due to a lack of connecting roads and customs facilities on the North Korean side, the source said. It officially opened about a week ago, marking a step toward strengthening economic ties between the neighbouring countries.
China is North Korea's largest trading partner and a key source of diplomatic, economic and political support for the isolated, nuclear-armed state, though relations have not always been smooth. The bridge opening comes just over a month after North Korea and Russia inaugurated their first road bridge, which Pyongyang hailed as a sign of closer ties.
Analysts say that while North Korea's trade with Russia largely involves military supplies, trade with China could provide goods needed to develop its civilian economy.