BEIRUT (AP) -- An Israeli air attack staged in Syria this week may be a sign of things to come.
Israeli military officials appear to have concluded that the risks of attacking Syria are worth taking when compared to the dangers of allowing sophisticated weapons to reach Hezbollah guerrillas in neighboring Lebanon.
With Syrian President Bashar Assad's grip on power weakening, Israeli officials fear he could soon lose control over his substantial arsenal of chemical and advanced weapons, which could slip into the hands of Hezbollah or other hostile groups. These concerns, combined with Hezbollah's own domestic problems, mean further military action could be likely.
Tzachi Hanegbi, an incoming lawmaker in Prime Minister Benjamin Netanyahu's Likud Party and a former chairman of parliament's influential foreign affairs and defense committee, signaled Thursday that Israel could be compelled to act on its own. While Israel's preference is for Western powers to gain control over Syria's arms stockpile, he said there are no signs of that happening.
"Israel finds itself, like it has many times in the past, facing a dilemma that only it knows how to respond to. And it could well be that we will reach a stage where we will have to make decisions," Hanegbi told Israel's Army Radio Thursday. Hanegbi, like other Israeli officials, would not confirm Israeli involvement in the airstrike.
In this week's incident, Israeli warplanes conducted a rare airstrike inside Syria, according to U.S. officials who said the target was a convoy carrying anti-aircraft weapons bound for Hezbollah, the powerful Lebanese militant group allied with Syria and Iran.
The Syrian military has denied the existence of any weapons shipment and said a military research facility outside Damascus was hit.
On Thursday, Syria threatened to retaliate, while Hezbollah condemned the attack as "barbaric aggression." Iran, which supplies arms to Syria, Hezbollah and the Hamas militant group in Gaza, said the airstrike would have significant implications for Israel. Syrian ally Russia said it appeared to be an unprovoked attack on a sovereign nation.
Syria's ambassador to Lebanon, Ali Abdul-Karim Ali, said Damascus "has the option and the capacity to surprise in retaliation." He told Hezbollah's al-Ahd news website that it was up to the relevant authorities to choose the time and place.
For now, Israeli officials seem to be playing down the threats.
"Israel took a big gamble out of the belief that Iran and Hezbollah won't retaliate. The question is, 'Are they right or not?'" said Moshe Maoz, a professor emeritus at Hebrew University who specializes in Syria.
Officials believe that Assad's position in Syria is so precarious that he cannot risk opening a new front with Israel. With an estimated 60,000 Syrians killed in the civil war, Israeli officials also think it's too late for Assad to rally his bitterly divided nation behind him.
"Syria is in such a bad state right now that an Israeli retaliation to a Syrian action would be harsh and could topple the regime. Therefore Syria is not responding," Maoz said.
Israel is far more worried about the threat of sophisticated weapons reaching Hezbollah. In a monthlong 2006 war, Hezbollah fired some 4,000 rockets and missiles into Israel before the conflict ended in a stalemate. Israeli officials believe the guerrilla group has restocked its arsenal with tens of thousands of missiles, some capable of striking deep inside the Jewish state.
Resigned to this fact, Israel has set a number of "red lines" for Hezbollah that it says are unacceptable, in particular the acquisition of new weapons that it believes would change the balance of power in the region. These include chemical weapons and sophisticated anti-aircraft and surface-to-sea missiles.
This week's airstrike targeted trucks containing Russian-made SA-17 anti-aircraft missiles, according to a U.S. official. The trucks were next to the military research facility identified by the Syrians, and the strike hit both the trucks and the facility, said the official, who spoke on condition of anonymity because he was not authorized to speak about the operation.
If the SA-17s were to have reached Hezbollah, they would have greatly inhibited the Israeli air force's ability to operate in Lebanon. Israel has frequently flown sorties over Lebanese skies since 2006.
The airstrike is part of an Israeli strategy known to military planners as "the policy of prevention," or the "war between wars." In recent years, Israel is believed to have launched a number of covert missions, including airstrikes in Sudan and assassinations of key Hezbollah and Hamas militants, aimed at disrupting the flow of weapons to its Iranian-backed enemies. Israel has never acknowledged involvement.