"We are approaching a strategic crossroads in the joint campaign against Iran. So far, we have achieved significant gains, including relative to the objectives we set at the outset of the operation," Zamir was quoted as saying in a military statement.

"We will continue to act with determination and intensify the damage inflicted on the regime."

The remarks came after the Israeli military announced it had struck eight bridges that it said were used by Iran's armed forces "for transporting weapons and military equipment".

Zamir also spoke of military operations in Lebanon, where Israeli forces have been fighting Iran-backed Hezbollah since March 2.

"Lebanon constitutes an additional central arena," Zamir said in the statement, adding that troops were "deepening the multi-focal effort to degrade the Hezbollah terrorist organisation".

"We continue to establish a forward defence posture to prevent direct fire toward our communities, while simultaneously operating against surface-to-surface fire," he added.

Earlier on Tuesday, the Israeli military said it had completed the deployment of ground troops along a "defence line" in southern Lebanon.

"War carries heavy costs, and we will continue to act to remove threats against our civilians," Zamir said.

The Israeli military has announced the deaths of 11 soldiers in combat in southern Lebanon.