Lebanese Press Agency said later that Hariri has left Abu Dhabi to Riyadh

Abu Dhabi Crown Prince Mohammed bin Zayed received former Lebanese PM Saad al-Hariri on Tuesday.

Hariri announced his surprise resignation on Saturday, citing a plot to kill him, and saying the climate in Lebanon resembled that before the assassination of his father Rafik al-Hariri, who was also prime minister, in 2005.

source: Alarabiya