Whatever the Israeli planes were doing in Syria, Iran’s nuclear program—which Tehran says is peaceful—couldn’t help but loom over their mission. “It’s a tacit reminder to Europe and to Washington that if they don’t take a tougher action against Iran, Israel may have to do it alone,” says Avner Cohen, a nuclear expert and a senior fellow at the United States Institute for Peace. Details of the Israeli operation remain hazy. Syria’s ambassador to the United States told NEWSWEEK the Israeli warplanes dropped munitions in the open desert near Dayr az Zawr before fleeing; he promised his country would retaliate in a manner and at a time of its choosing. “Israel will not be permitted to do whatever it does without paying a price,” says Imad Moustapha. But the unparalleled censorship Israel clamped on the operation has fueled speculation that the target could have been a missile factory or nuclear technology from North Korea. (Some U.S. intelligence sources say the latter claim is shaky.)

The story of the Israeli operation appears to have begun with aerial photographs shot from a spy plane or satellite. A former U.S. official, who asked for anonymity to discuss sensitive matters, told NEWSWEEK that Israel showed the images of a site in northern Syria to a very small group of officials in Washington last month, suggesting it was part of a nuclear project underway with North Korean involvement. Bush administration neocons have long contended that Damascus was trying to buy nuclear material and that Pyongyang, alleged to have been selling missiles to Syria and Iran since the 1990s, could be a potential supplier. When North Korea issued an unusually loud condemnation of Israel last week, hard-liners like former U.N. ambassador John Bolton read it as possible evidence of Pyongyang’s involvement in the matter.

But current and former U.S. intelligence officials, willing to speak only if they were not named, say they’ve seen no credible evidence yet of nuclear ties between North Korea and Syria, whether before or since the Israeli operation. David Albright, a former weapons inspector in Iraq, says allegations raised by Bolton prompted the International Atomic Energy Agency to inspect Syria’s small nuclear research reactor and other sites in 2003. He says the agency found the claims to be “unsubstantiated.” Even Bolton, who served as the State Department’s under secretary for arms control and international security, acknowledged to NEWSWEEK THAT while in government, he never saw proof North Korea was sharing nuclear technology with Syria.

For Israel, the possibility of a nuclear-armed adversary might have been enough to warrant the operation. Officially in a state of war with Syria—and Iran—Israel has vowed to let neither country obtain nukes (though Israel itself is believed to have built at least 200 nuclear bombs in its secret Dimona plant). Earlier this year, according to a well-placed Israeli source, Prime Minister Ehud Olmert asked President Bush for assurances that if economic and political sanctions failed to get Iran to shut down its nuclear facilities, Bush would order the U.S. military to destroy them before he leaves office. Bush has yet to provide the assurances, according to the source, who refused to be quoted because he is not authorized to speak for the government. The source says the Israeli government believes the Iranians will reach the point of no return in their nuclear-enrichment program sometime next year.

U.S. intelligence agencies, by contrast, believe Iran is still two to eight years away from mastering the technology to build a bomb. Some officials warn that attacking Iran would mire U.S. forces in another messy war and might prove ineffective, since the Iranian facilities are believed to be scattered across the country and buried deep underground. Still, from Israel’s perspective, there might never be a more supportive White House. “It makes sense that if Israel has to do it alone, it would want to do it on Bush’s watch and not wait to see what the political attitude of the next administration will be,” says Alpher. That Arab states, and the world, will look away next time might be too much to assume.