A US administration official said Israeli officials believed that North Korea might be unloading some of its nuclear material on Syria, the Times reported.
"The Israelis think North Korea is selling to Iran and Syria what little they have left," the unidentified official was quoted as saying.
A US defense official confirmed Tuesday that Israel carried out an air strike well inside Syria last week, apparently to send Damascus a message not to rearm Hezbollah in Lebanon.
The official, who spoke on condition of anonymity, did not know the target of the strike, which was conducted Thursday, but said the US military believed it was to send a message to the Syrians.
"The Israelis are trying to tell the Syrians: 'Don't support a resurgence of Hezbollah in Lebanon.'"
Israel fought a devastating 34-day war in July and August 2006 against Hezbollah, whose missile firepower and use of sophisticated weaponry surprised the Israelis.