North Korea has continued to develop its nuclear and ballistic missile programmes including its capability to produce nuclear device components in violation of U.N. Security Council resolutions, U.N. experts have said in a new report.

The panel of experts said in the executive summary of the report obtained Saturday night by The Associated Press that there was “a marked acceleration” of Pyongyang’s testing and demonstration of new short-range and possibly medium-range missiles through January, “incorporating both ballistic and guidance technologies and using both solid and liquid propellants.”