Hundreds of Israeli tanks are massing along the Lebanese border as fears rise of a ground invasion into the country. The Israel Defense Forces also announced that it has mobilized 2 reserve brigades for its operations on the Northern border, writes TIME.

The tanks and troops were pictured after Hezbollah confirmed that its leader Hassan Nasrallah was killed in an airstrike on Friday in Beirut along with several other senior commanders, according to British broadcaster SkyNews.

Hezbollah deputy leader Naim Kassem promised in a TV announcement the militant group would continue to fight, saying they were prepared for further Israeli escalations, including a possible ground invasion: “Israel was not able to affect our (military) capabilities. There are deputy commanders and there are replacements in case a commander is wounded in any post”.

Over 1,000 people have been killed as a result of Israeli strikes in the last two weeks, a quarter of them women and children, according to Lebanon’s health ministry. The death toll is expected to climb as rescuers sift through the rubble of dozens of buildings that have been razed.

As many as 1 million people in Lebanon may have been displaced amid the barrage, Prime Minister Najib Mikati said. He added that the scale of the displacement is the largest in Lebanese history.