Prime Minister Tammam Salam was in Jordan on Wednesday on a one-day official visit at a head of a large delegation that will attend the meetings of the joint Lebanese-Jordanian Higher Committee.

Jordan's Prime Minister Abdullah Ensour and Salam jointly chaired the meetings.

A 20-year-old Jordanian-American who flew overseas in an apparent bid to join the Islamic State extremist group, appeared in court near New York on Monday on terror allegations, prosecutors said.

He is one of at least four U.S. citizens from the greater New York area arrested in recent months on suspicion of being part of a ring of supporters of the group fighting in Iraq and Syria.

The Jordanian airforce will buy nine Pilatus training aircraft for fighter jet pilots, the Swiss company said Monday, without divulging the price tag on the deal.

The deal for the nine PC-9 M two-seater planes also includes a simulator, training equipment and logistics support, Pilatus Aircraft said in a statement.

Sources close to Prime Minister Tammam Salam have expressed confidence that there is consensus to confront Free Patriotic Movement leader MP Michel Aoun's call for street demonstrations against the military extensions.

“Each day has its own events,” the sources said. “Salam is not alone responsible for confrontation.”

Prime Minister Tammam Salam is scheduled to travel to Jordan next week on an official visit, reported al-Joumhouria newspaper on Saturday.

It said that the premier is set to head to the kingdom on Wednesday to chair the meetings of the joint Jordanian-Lebanese higher committee.

Jordan handed down jail sentences Wednesday against seven of its citizens and a Syrian for planning attacks on U.S. soldiers in the country and on the Israeli embassy, a judicial source said.

The plots in question would have involved "terrorist acts" against the U.S. service personnel at a Jordan military base in Al-Moaqar in 2006 and against the Israeli embassy in Amman in 2008, the source said without elaborating.

Twelve Jordanians were sentenced on Tuesday to jail terms of up to 15 years for their involvement in a cell recruiting members for the Palestinian Islamist movement Hamas.

Of 16 defendants, "four were acquitted and 12 convicted of terrorist offenses", a judicial source said.

The Jordanian intelligence services have been holding an uncle of the man who killed five U.S. troops in Tennessee last week, his lawyer told AFP on Wednesday.

"The intelligence services have been illegally detaining my client, university lecturer Assaad Ibrahim al-Haj Ali, since Friday," the day after the attack, Abdelkader al-Khatib said.

U.S. Defense Secretary Ashton Carter landed in Jordan Tuesday and met American troops stationed there and colleagues of a Jordanian pilot burned alive by the Islamic State group.

Carter is on the second leg of a regional mission to try to reassure Washington's allies over the nuclear deal between major powers and Iran, but was not scheduled to hold talks with Jordanian officials on that subject.

On a hilltop lookout near Israel's border with Lebanon, U.S. Defense Secretary Ash Carter offered personal assurances Monday that the U.S. will help Israel counter Iranian support for Hizbullah. He called it one example of how the U.S. can support the Jewish state in the aftermath of the Iran nuclear deal.

Carter visited Hussein Lookout, with a sweeping view of the border as well as the Golan Heights, in an effort to emphasize U.S. concern about a range of threats that face Israel. These include tens of thousands of short-, medium- and longer-range Hizbullah rockets and missiles in southern Lebanon that could hit Israeli villages and cities.