By Michelle Nichols and Don Durfee
NEW YORK (Reuters) -Senior Hezbollah commanders were the target of Israel's strike on the group's central headquarters in Beirut's suburbs on Friday but it was too early to say whether the attack took out its leader Sayyed Hassan Nasrallah, a senior Israeli official said on Friday.
"I think it's too early to say, but, you know, it's a question of time. Sometimes they hide the fact when we succeed," the official told reporters when asked if the Israeli strike on Friday had killed Nasrallah.
The Israeli military said it had targeted Iran-backed Hezbollah's central headquarters in Beirut in an attack that shook the Lebanese capital.
Asked how long it might take to determine the fate of Nasrallah, the senior Israeli official said: "Certainly if he's alive, you'll know it very immediately. If he's dead, it may take some time."
The official, who was briefing reporters in New York on condition of anonymity, said: "We cannot survive if we don't stop this and reverse it," he said, referring to the threat to Israel from Iran-backed militia in the region.
"It's impossible to reverse it without a general war. That was the assumption, a general war with Hezbollah, which, of course, entails the possibility of a broader war with Iran."
"The other way to do it was to take him out. That's the only thing. If you take him out, you not only neutralize, possibly neutralize that front, because nothing else will, but you also break a lynchpin. You break a central axis of the axis."
Nasrallah became secretary general of Hezbollah in 1992 at just 35, the public face of a once shadowy group founded by Iran's Revolutionary Guards in 1982 to fight Israeli occupation forces.
Israel killed his predecessor, Sayyed Abbas al-Musawi, in a helicopter attack.
The official defended Israel's action when asked why killing Nasrallah would change the threat from Hezbollah when earlier assassinations of militant leaders had not hobbled their organizations.
"I think it's different," the official said. "In many ways he keeps this thing focused, alive and kicking."
"Some people are irreplaceable. It happens, some people do not have a substitute. That's one of the cases, there's no question," the official said.
"About 10 days ago or two weeks ago, the cabinet made a decision that we cannot have - after a year - Israelis who are basically refugees in their own land," the official said.
"So we added a formal war aim to bring our people back, to degrade Hezbollah's power, to be able to push them back from the border, to destroy the infrastructure along the border, to change the balance of forces."
"The most important thing that we did was to try to take out about half of the missile and rocket capabilities that he built up over the last 30 years with Iran, and to take it out in a few hours. And we did," the official said.
"I can't tell you what will evolve, but I can tell you that this could be a pivot. We don't seek a broader war. In fact, we seek not to have a broader war and Iran has to consider what it does now," the official said.