The Israeli military said the Lebanese militant group Hezbollah fired into a disputed border zone on Monday, its first attack since a ceasefire took hold last week after Lebanon accused Israel of violating the truce more than 50 times in recent days.

Hezbollah said its attack was a warning to Israel over the alleged ceasefire violations.

Donald Trump has been calling for an immediate ceasefire and hostage exchange in Gaza as his presidency looms. 

The Israeli military said two projectiles were launched toward Mount Dov, a disputed Israeli-held territory known as Shebaa Farms in Lebanon, where the borders of Lebanon, Syria, and Israel meet.

Israel said the projectiles fell in open areas, and no injuries were reported.

Last Wednesday, a U.S.- and French-brokered ceasefire came into effect, calling for a 60 halt in fighting, aiming to end more than a year of exchanges of fire between Hezbollah and Israel.

Israel unleashed its most significant wave of airstrikes across Lebanon since agreeing to a ceasefire with Hezbollah last week, killing at least 11 people on Monday after the Lebanese militant group fired a volley of projectiles as a warning over what it said were Israeli truce violations.

The projectiles were the first time that Hezbollah aimed at Israeli forces after the 60-day ceasefire went into effect last Wednesday.

The increasingly fragile truce aimed to end more than a year of war between Hezbollah and Israel — part of a broader regional conflict sparked by the devastating Israel-Hamas war in Gaza.

In the United States, President-elect Donald Trump demanded the immediate release of Israeli hostages held by the Palestinian militant Hamas group in Gaza, saying on social media that if they were not freed before he takes office in January, there would be “HELL TO PAY.”

It was not immediately clear whether Trump was threatening to directly involve the U.S. military in Israel’s ongoing war in Gaza.

The U.S. has given Israel crucial military and diplomatic support throughout the nearly 15-month conflict.