REUTERS, 16th MARCH, 2018-South Korean officials began preparations on Friday for a summit next month with North Korea aimed at reducing tensions on the peninsula, as a report showed the North had probably begun testing a nuclear weapon.

The report by intelligence analysts at Jane’s by IHS Markit said satellite imagery from Feb. 25 showed emissions of non-condensable gases from a stack at the North’s experimental light water reactor (ELWR) at the Yongbyon Atomic Energy Research Centre, suggesting preliminary testing had likely begun.

The reactor could be used to produce weapons-grade plutonium, but North Korea is believed to already have enough fissile material for multiple nuclear bombs, according to Joshua Pollack, a senior research associate at the Middlebury Institute of International Studies at Monterey.