Iranian armed forces are preparing several military plans with a view to a possible retaliatory strike by Israel, writes the "New York Times", quoted by BTA.
The harshness of the response depends on what Israel will do, writes the American edition.
If the Israeli armed forces launch a major attack on Iran, such as an attack on oil and nuclear infrastructure, the response would be fierce.
In the event of this scenario, Iran is considering launching up to 1,000 ballistic missiles at Israel, escalating attacks by its proxy allies in the region and disrupting shipping in the Gulf and through the Strait of Hormuz.
If Israel's attacks are limited to warehouses or a few military bases, Iran may not even respond, writes the "New York Times".
Iran supports a network of armed groups and political organizations in the Middle East, among them the Lebanese Shiite movement "Hezbollah" in Lebanon, the Palestinian Islamist movement "Hamas" in the Gaza Strip and the Yemeni Houthis. All these organizations carry out attacks against Israel.
In early October, Iran fired about 200 ballistic missiles at Israel. The Israeli government has said it will respond to the attack, but it is not clear when or how it will do so.