Iran's president has warned that the "tiniest invasion" by Israel would bring a "massive and harsh" response, as the region braces for potential Israeli retaliation after Iran's attack over the weekend.

President Ebrahim Raisi spoke Wednesday at an annual army parade that was relocated to a barracks north of the capital, Tehran, from its usual venue on a highway in the city's southern outskirts. Iranian authorities gave no explanation for its relocation, and state TV did not broadcast it live, as it has in previous years.

Iran launched hundreds of missiles and drones at Israel over the weekend in response to an apparent Israeli strike on Iran's embassy compound in Syria on April 1 that killed 12 people, including two Iranian generals.

Israel, with help from the United States, the United Kingdom, neighboring Jordan and other nations, successfully intercepted nearly all the missiles and drones.

Israel has vowed to respond, without saying when or how, while its allies have urged all sides to avoid further escalation.

Raisi said Saturday's attack was a limited one, and that if Iran had wanted to carry out a bigger attack, "nothing would remain from the Zionist regime." His remarks were carried by the official IRNA news agency.

Israel and Iran have waged a shadow war for decades, but the strike over the weekend was the first direct Iranian military attack on Israel.

Tensions in the region have increased since the start of the latest Israel-Hamas war on Oct. 7, when Hamas and Islamic Jihad, two militant groups backed by Iran, carried out a cross-border attack that killed 1,200 people in Israel and kidnapped 250 others. Israel responded with an offensive in Gaza that has caused widespread devastation and killed more than 33,800 people, according to local health officials.