President Michel Aoun on Wednesday accused Saudi Arabia of having "detained" Prime Minister Saad Hariri, who announced his resignation in a statement from the kingdom earlier this month.

"Nothing justifies the failure of Prime Minister Saad Hariri to return for 12 days, therefore we consider him to be held and detained, contrary to the Vienna Convention," Aoun said in a tweet on the official Lebanese presidency account.

Al-Mustaqbal Movement strongly replied to Syrian President Bashar Assad's accusations against Prime Minister Saad Hariri, urging him to “stop sticking his nose in Lebanon's affairs.”

Prime Minister Saad Hariri, who submitted his resignation on November 4 from Saudi Arabia, will reportedly return to Lebanon within two days, al-Akhbar daily reported on Wednesday.

The Lebanese army on Tuesday arrested fugitive Islamist cleric Mustafa al-Hujeiri, aka Abou Taqiyeh, in the northeastern border town of Arsal, the Army Command-Orientation Directorate said in a statement.

The statement added that the arrest was made early at dawn and that interrogations have kicked off with the related judiciary.

French Prime Minister Edouard Philippe said Tuesday that Prime Minister Saad Hariri must be able to return to Lebanon from Saudi Arabia to end uncertainty caused by his shock resignation.

"What's at stake is Mr. Hariri being able to return home freely to clarify his situation in line with the Lebanese constitution," Philippe told French parliament, saying his resignation, announced in Saudi Arabia, had caused "a period of uncertainty."

Foreign Minister Jebran Bassil has flown to Brussels on the first leg of a European tour that aims to rally support for Lebanon's stability following Prime Minister Saad Hariri's contentious resignation from Saudi Arabia.

“Lebanon is still addressing the problem with Saudi Arabia within the framework of brotherly bilateral ties and the tour is to urge the kingdom to realize that what's happening is unacceptable,” Bassil said after arriving in Brussels.

Maronite Patriarch Beshara al-Rahi held separate talks Tuesday in in Riyadh with Saudi King Salman, Crown Prince Mohammed bin Salman and Prime Minister Saad Hariri as part of a historic visit to the kingdom.

The visit comes amid tensions between the two countries after Hariri's shock resignation.

Maronite Patriarch Beshara al-Rahi kicked off a trip to Saudi Arabia on Monday where he is scheduled to hold talks with King Salman bin Abdul Aziz, Crown Prince Mohammed bin Salman and Lebanon's Prime Minister Saad Hariri who has been in Riyadh since his shock resignation on Nov. 4.

British Foreign Secretary Boris Johnson reiterated in talks with his Lebanese counterpart Jebran Bassil, the UK's support for Lebanon and that the country should not be used as a tool for proxy conflicts, a press release said on Monday.

Qatar’s Foreign Minister Mohamed bin Abdulrahman al-Thani said on Monday that “Lebanon’s stability should be restored as soon as possible” as he urged everyone to avoid “intervening in the country’s internal affairs.”