Tehran: Iran's president yesterday said that if the Israelis launch a new war against Lebanon's Hezbollah, the militant group should retaliate strong enough to "close their case once and for all."

Mahmoud Ahmadinejad's comments, in a conversation with Hezbollah's leader, were the latest in a heated exchange of rhetoric between Israel and Lebanon and Syria this month in which all sides have been warning the other not to start a war.

Speaking by phone, Ahmadinejad urged Hezbollah leader Shaikh Hassan Nasrallah to prepare his fighters to be able to retaliate strongly against any Israeli attack.

"The preparations should be of the level that, if they [the Israelis] want to repeated the mistakes of the past [by attacking], then their case should be closed once and for all and the region delivered from their evil ways forever," the Iranian president said, according to the state news agency IRNA.

"The people of Iran will stand by the peoples of Lebanon and the region in this," he said. Nasrallah dismissed any fears, saying Israeli "threats will lead to nothing."

Iran is a key supporter of Hezbollah, believed to funnel it weapons and millions of dollars in funding, though Tehran denies arming the Shiite group. Hezbollah, also closely allied to Syria, boasts a heavy arsenal of rockets capable of reaching deep inside Israel.