Prime Minister Benjamin Netanyahu said on Monday that Israel's air attack on Iran last month hit an element of Tehran's nuclear program while degrading its defence and missile production capabilities.

"It's not a secret," Netanyahu said in a speech in parliament. "There is a specific component in their nuclear program that was hit in this attack."

However, Netanyahu added that Iran's path to a nuclear weapon had not been blocked.

On Oct. 26, Israeli fighter jets carried out three waves of attacks on Iranian military targets, a few weeks after Iran had fired a barrage of about 200 ballistic missiles against Israel.

This followed a previous exchange of direct attacks in April.

Netanyahu, in his speech, offered a few more details on what Israel had targeted.

Israel's April strike, he said, was narrower, taking out one of four Russian-supplied S-300 surface-to-air missile defence batteries around Tehran, the Iranian capital.

He said that in October, Israel destroyed the remaining three batteries and caused serious damage to Iran's ballistic missile production capabilities and its ability to produce solid fuel, which is used in long-range ballistic missiles.

Israel has dealt the Iran-backed Hezbollah big blows since launching an offensive against the group, killing its leader Sayyed Hassan Nasrallah and pounding Lebanon with airstrikes. Hezbollah has kept up rocket fire into northern Israel, where sirens sounded again on Monday.

Israel launched its September offensive after almost a year of cross-border hostilities with Hezbollah. Its declared goal is to dismantle Hezbollah's capabilities to secure the return of tens of thousands of Israelis who evacuated the north due to rockets fired by Hezbollah in solidarity with its ally Hamas as the Gaza war began more than a year ago.

Israel's campaign has killed at least 3,481 people in Lebanon since hostilities began, most since late September, Lebanese authorities say, and uprooted more than a million people.

The figures do not distinguish between combatants and civilians.

Hezbollah strikes have killed at least 43 civilians in northern Israel and the Israeli-occupied Golan Heights, while 73 soldiers have been killed in strikes in northern Israel and the Golan Heights and in combat in southern Lebanon, according to Israeli figures.