North Korea shipped uranium to Iran?

This is from a New York Post column by Benny Avni, Israel Radio's New York correspondent.

Japan's Nikkei newspaper last week quoted unnamed sources from "Western intelligence organizations" saying they are investigating a suspicious ship that traveled recently from North Korea to Iran, carrying "several dozen tons of enriched uranium hidden in its cargo." (As a result of the Iranian-North Korean alliance, I'm told, Japan increasingly shares intelligence data with several Middle Eastern countries.)

Hmmm.