Iran said Wednesday that it is blocking shipping through the Strait of Hormuz over Israel's escalating bombardment of Lebanon, actions that are threatening to unravel the tenuous ceasefire agreed to less than a day ago.

Fars, an Iranian state media outlet, reported that "simultaneous with Israel's attacks on Lebanon, the passage of oil tankers through the Strait of Hormuz has been stopped," while Reuters said that there were "more than 180 tankers believed to be inside [the] strait, with hundreds more waiting" for access.

The developments came after two tankers were reportedly allowed to pass through the vital waterway – through which around 20% of the world's oil is shipped – in the wake of Tuesday's ceasefire agreement between the United States, Israel, and Iran.

While Israel accepted the two-week truce, it insists that the agreement does not apply to its ongoing war on Hezbollah in Lebanon. Iran counters that halting attacks on Lebanon is one of the 10 points in the Pakistan-brokered deal, which Israel is violating.

Over the past 24 hours, Israeli forces have ramped up their already intense bombing of Lebanon to levels described as "apocalyptic." Lebanon's Health Ministry said at least 254 people have been killed and 1,165 others wounded by Israel Defense Forces (IDF) bombing throughout the country, with some official sources telling media outlets that as many as 300 people have been killed.

More than 100 sites across Lebanon were reportedly bombed within a period of just minutes, including densely populated urban areas. In southern Lebanon, the dead include 12 medics, according to officials cited by Reuters.

Lebanese Prime Minister Nawaf Salam on Wednesday implored sympathetic nations to put pressure on Israel to stop the bombing.

"All of Lebanon's friends are called upon to help us stop these attacks by all available means," he said.

Iran's Press TV reported Wednesday that Iranian leaders are considering resuming full-scale counterattacks in response to Israel's escalation. According to the outlet, a senior Iranian official said that the time has come to "put this aggressor regime in its place."

Iranian and international media outlets also reported Wednesday that Iran might withdraw from the ceasefire altogether if Israel keeps bombing Lebanon.