The United States is monitoring a North Korean vessel that appears to be suspicious, a US intelligence source said on Thursday.
"It isn't clear what it's carrying. It's a suspicious vessel," the source said.
The "CBS Evening News," quoting US intelligence sources, reported that a North Korean ship possibly carrying military equipment banned by UN sanctions had left that country for an unknown destination.
The report said the ship was being tracked while US officials tried to determine what was on board and what to do about it. No other details were available.
The UN Security Council approved financial and weapons sanctions against North Korea on Saturday after the communist state's first nuclear test on October 9 drew worldwide condemnation.
US President George W. Bush warned North Korea on Wednesday of a "grave consequence" if it tried to sell nuclear arms.