The Treasury Department building is pictured at dusk in Washington, Jun. 6, 2019. AP-Yonhap

WASHINGTON — The U.S. Treasury Department has published a list of medical devices requiring "specific authorization" for export to North Korea, a Federal Register notice showed Friday, apparently tightening licensing requirements for the items amid North Korea's advancing nuclear and missile threats.

On Thursday, the department's Office of Foreign Assets Control (OFAC) released the list of medical devices that may not be exported or reexported to North Korea under a general license that authorizes the exportation to the North of certain agricultural commodities, medicine and medical devices.

The items on the new list require specific authorization from the OFAC for exports to North Korea, the office said. The list took effect on Thursday.

The list includes oxygen generators, pumps with flow rates of more than one liter per minute and diagnostic medical imaging equipment, such as gamma imaging equipment, tactile imaging equipment and thermography equipment.