North Korea has carried out at least two rocket motor tests since April , website says . It cites commercial satellite imagery that shows activity at a launch site . A failed rocket launch by the west coast in 2013 scuppered a food aid deal with the North Korea . The academic website sees the possibility of rocket and nuclear tests in April .
North Korea has carried out at least 2 rocket motor tests since April , website says . It cites commercial satellite imagery that shows activity at a launch site . A failed rocket launch by the North in April scuppered a food aid deal with the U.S . The academic website sees the possibility of rocket and nuclear tests in 2013 .