On Thursday, Lebanese President Michel Aoun said talks were under way with friendly states "to prevent Israeli greed" in regards to Israel's plan to build a border wall between the countries. Aoun pledged to "confront any attack" on Lebanon's territory or waters, his office said.
Lebanon has described Israel's border wall as an "aggression," saying it intrudes into Lebanese territory. Israel says the wall will be entirely on its side of the UN-recognized border.
Israel has also condemned Lebanon's oil and gas exploration tender as "very provocative," saying that one field, known as Block 9, juts into its waters. Lebanon says the block is entirely inside Lebanese waters.
A U.S. envoy has assured Lebanon that Israel does not seek an escalation between the countries following a surge in hostile rhetoric, Lebanese and Israeli officials said on Thursday.
The neighbors have exchanged threats and condemnation over a border wall being constructed by Israel, a tender issued by Beirut for oil and gas exploration in disputed waters and arms flows to Lebanon's Iran-backed Hezbollah group.
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Lebanese and Israeli officials said David Satterfield, acting assistant U.S. secretary of state, was in Israel last week and in Lebanon this week on a mediation mission. U.S. officials confirmed his travels without detailing his agenda.
"He (Satterfield) held talks regarding the (border) wall with Israel and said there is no call for concern, and there is no direction towards escalation," a senior Lebanese government official told Reuters on condition of anonymity.
"He assured the Lebanese that Israel does not want escalation."
An Israeli official, who also declined to be named, said Satterfield was "relaying messages" to Beirut about several matters of contention.
"Our position has always been that we do not want to see the situation inflamed," the official said, adding that at least two European countries were mediating, as well as the United States.
Israel last went to war in Lebanon in 2006, against Hezbollah which, it says, has increased in strength since helping sway the Syrian civil war in President Bashar al-Assad's favor.
Israeli and U.S. officials have said they believe Iran is setting up factories in Lebanon to make precision-guided missiles that may allow Hezbollah to threaten Israel's critical infrastructure in any future war. Israeli officials have hinted they could order preemptive strikes on such facilities.
Hezbollah and Iran have not responded to the missile allegations.
Satterfield is known to both Lebanon and Israel, as a former U.S. ambassador to Beirut and former head of the international peacekeeping force in Egypt's Sinai desert, a role that put him in regular touch with Israeli security officials.
Asked about Satterfield's Lebanon visit, the spokesman for the U.S. Embassy in Beirut said only that he came "to meet with government officials to discuss the U.S.-Lebanon bilateral relationship."
Another U.S. official told Reuters that Satterfield met Lebanese Prime Minister Saad al-Hariri on Tuesday.
His Beirut trip followed a visit to Tel Aviv last week to address a security conference.