Hezbollah said Wednesday it clashed with Israeli soldiers who tried to infiltrate into Lebanon, and also targeted Israeli troops across the border.

Hezbollah fighters confronted "an Israeli enemy infantry force that tried to infiltrate into the village of Adaysseh... and clashed with them... and forced them to withdraw", a statement said. Hezbollah fighters later clashed with troops who crossed into Maroun al-Ras, "inflicting casualties among them."

The Israeli army on Wednesday called for the evacuation of additional villages in southern Lebanon, a day after a similar evacuation call after the military announced the launch of ground operations.

"Evacuate your homes immediately. Be careful, you must not go south. Any southward movement may put you in danger," said Israeli military spokesman Avichay Adraee in a post on social media, calling on residents to evacuate over 20 new villages and towns in south Lebanon.

At least 17 Israeli strikes hit Beirut's southern suburbs early Wednesday, as the Israeli military said it was targeting alleged Hezbollah sites and issued several evacuation orders.

AFP correspondents heard multiple explosions and saw smoke rising in one area while a fire appeared to burn.

Israeli police said on Wednesday that a total of seven people were killed in a shooting attack in Tel Aviv on Tuesday evening minutes before the Iranian missile barrage.

Two Palestinian men from the Israeli-occupied West Bank city of Hebron opened fire in the Jaffa neighborhood of Tel Aviv, including shooting directly into a light rail carriage crowded with passengers that was stopped at a station.

Air traffic was halted at Israel's Ben Gurion airport on Tuesday, a spokesman said, as blasts rocked the country after Iran launched a missile attack.

Iran's Revolutionary Guards said the missile attack under way against Israel was in response to the killing of Hezbollah chief Sayyed Hassan Nasrallah last week as well as that of the Hamas leader.

The Israeli military said it launched a fresh strike on south Beirut on Tuesday.

"The IDF (Israeli military) conducted a precise strike in Beirut," the statement said, without offering details, while local media outlets reported simultaneous strikes on an apartment in a building in Jnah near al-Zahraa Hospital, and on another region in Beirut's southern suburbs.

"The United States has indications that Iran is preparing to imminently launch a ballistic missile attack against Israel," a senior White House official told AFP on Tuesday, speaking on condition of anonymity.

"We are actively supporting defensive preparations to defend Israel against this attack," the official said in a statement, warning that such an action "will carry severe consequences for Iran."

The Israeli army mobilized four additional brigades to be deployed in missions along the northern border, the military said on Tuesday, after it claimed ground operations targeting Hezbollah positions in southern Lebanon overnight.

"This will enable the continuation of operational activity against the Hezbollah terrorist organization and the achievement of operational goals, including the safe return of the residents of northern Israel to their homes," the army said in a statement.

Israeli Defense Minister Yoav Gallant briefed U.S. Defense Secretary Lloyd Austin on ground operations the army launched inside south Lebanon targeting Hezbollah positions, his office said on Tuesday.

"The minister discussed the localized and targeted raids that the IDF (Israeli army) launched overnight, against Hezbollah terror targets in the border area of southern Lebanon," said the statement from the defense ministry.

Parliament Speaker Nabih Berri, a Hezbollah ally, on Tuesday called for a United Nations air bridge for aid deliveries for almost a million people displaced by Israeli strikes.

Berri called on the United Nations to establish an "air bridge to ensure the delivery of relief supplies", a statement issued by his office said, also urging the International and Lebanese Red Cross to "carry out their duties in delivering relief and medical supplies to south Lebanon".