More than 19,000 people have been displaced in Lebanon amid an uptick in tensions between Israel and Hezbollah at the country's southern border, figures released Monday by a United Nations agency showed.

"An increase in cross-border incidents" has resulted in the displacement of 19,646 people in Lebanon, "both within the south and elsewhere within the country", said the International Organization for Migration.

The Israeli army shelled Monday the outskirts of the southern Lebanese town of Rmeish, after it claimed having intercepted 2 drones that entered from Lebanon.

Soon afterwards, two anti-tank missiles were fired at an Israeli post in the Galilee, triggering alert sirens in Kiryat Shmona on the border with Lebanon. Israeli media reported three injuries. The Israeli army also said al-Marj military post, which faces the Lebanese town of Markaba, was attacked.

Lebanon will face “very dangerous consequences” should attacks continue against Israel from Lebanese territory, a spokesman for Israeli Prime Minister Benjamin Netanyahu said.

Lebanon has the right to defend itself against Israel, Parliament Speaker Nabih Berri said Monday, a few minutes after the Lebanese Red Cross said it has transferred a dead body from the Arqoub region, rising the death toll in Lebanon to 33.

The Red Cross transferred four injured fighters and one dead body from the border town of Kfarhamam in the Arqoub region to the Marjaayoun Governmental Hospital.

Free Patriotic Movement chief Jebran Bassil met Monday with caretaker Prime Minister Najib Mikati at the Grand Serail as part of a tour over the military developments in south Lebanon and Gaza.

The Hezbollah-linked Resistance Brigades, also known as Saraya al-Moqawama, announced Monday the death of two of its members "as they performed their national duties."

The Resistance Brigades was created in 1997 by Hezbollah's leadership. The group comprised Lebanese young men from various sects who wanted to fight the Israeli occupation of south Lebanon without having to officially join Hezbollah. The group was not disbanded after Israel's withdrawal from the South in 2000.

The United States warned Iran or its allies against any "escalation" in the wake of Israel's war with Hamas, two top U.S. officials said, hours after the Pentagon moved to step up military readiness in the region.

With tensions mounting, Washington also announced Sunday it had ordered non-emergency staff to leave its embassy in Iraq.

Hezbollah announced the deaths of seven more militants as clashes along the Lebanon-Israel border intensified and the Israeli prime minister warned Lebanon on Sunday not to let itself get dragged into a new war.

Israeli soldiers and Hezbollah militants have traded fire across the border since Israel's war with the Palestinian group Hamas began, but the launches so far have targeted limited areas.

Shocked by images of dead children in Gaza, Mustafa al-Sayyid quickly whisked his family to the closest shelter when Israeli strikes began near his village in southern Lebanon this week.

"What we are seeing on television -- the massacres happening in Gaza, the children -- it cuts your heart to pieces," said the 53-year-old from Beit Leef, barely six kilometers from the Israeli border.

Hezbollah will make "the mistake of its life" if it starts a war with Israel, Prime Minister Benjamin Netanyahu said Sunday, as tensions rose on the Israel-Lebanon border.

His remarks came during a visit as the Israeli leader visited troops near Israel's northern border with Lebanon where increasing artillery exchanges have heightened fears of a new front opening as Israel battles Hamas in Gaza.