The head of an American organisation focused on hostage releases said on Monday he believes U.S. journalist Austin Tice was still being held in Syria by people loyal to toppled leader Bashar al-Assad.

The selection of Mr. Salam was seen as a blow to Hezbollah, the Lebanese militant group and political party that has acted as the real power in Lebanon for decades.

Lebanon's Prime Minister-designate Nawaf Salam said on Tuesday his hands were "extended to everyone", in a gesture to the Iran-backed Hezbollah militant group that accused opponents of seeking to exclude it by nominating him for the post.

Salam says he is reaching out across the political spectrum in nod to Hezbollah, which opposed his nomination.