The United States on Tuesday urged North Korea to stop behaviours that threaten a further escalation of tensions in the region, after reports that it destroyed parts of roads on the northern side of the demarcation line with South Korea. The Joint Chiefs of Staff in Seoul said that Pyongyang on Tuesday blew up parts of two roads near the Military Demarcation Line separating the two countries, according to the South Korean news agency Yonhap. North Korea had announced plans to cut off all road and rail connections with its southern neighbour last week, amid a pickup in tensions. State media sai…