Iran has told mediators it will only take part in in-person talks with the United States, set to take place in Pakistan, if the current ceasefire agreement is expanded to include Lebanon, according to people familiar with the matter cited by The Wall Street Journal.

The sources said Iranian officials warned that Tehran could escalate its response if Israeli strikes on Hezbollah in Lebanon continue. This could include renewed attacks against regional targets, including Israel, and reversing its decision to reopen the Strait of Hormuz to oil tanker traffic.

The developments come amid conflicting interpretations of a ceasefire reached overnight between Washington and Tehran. U.S. President Donald Trump has made clear that the agreement does not include Lebanon, describing the conflict involving Hezbollah as a separate issue.

Iran’s Islamic Revolutionary Guard Corps warned it would respond if Israel did not stop its attacks on Lebanon, threatening both the U.S. and "its Zionist ally" that Tehran will fulfill its duty and "deliver a response."

Meanwhile, the semi-official Fars news agency reported that Tehran had halted the passage of oil tankers through the Strait of Hormuz in response to Israeli strikes on Lebanese territory. According to the report, the flow of tankers was briefly suspended, though two vessels were allowed to pass on Wednesday morning after the ceasefire took effect.

“Simultaneous with Israel’s attacks on Lebanon, the passage of oil tankers through the Strait of Hormuz has been stopped,” Fars reported.

At the same time, Iranian officials are said to be weighing possible retaliatory measures against Israel. An informed security source quoted by Fars said Tehran is preparing “deterrent operations” targeting Israeli military positions, accusing Israel of violating what Iran views as a broader ceasefire framework by continuing to strike Hezbollah targets in Lebanon.

“Following the continued violations of the temporary ceasefire by the Israeli regime’s army against Lebanon and the country’s Islamic resistance, Iran is finalizing plans to carry out a deterrent operation against Israeli military positions in the occupied territories,” the source said.

The source added that officials in Tehran increasingly see Israel’s continued strikes “despite the agreement on all fronts” as evidence either that Washington is unable to restrain Israeli Prime Minister Benjamin Netanyahu or that U.S. Central Command has effectively given Israel freedom of action.