Lebanese officials have said Hariri is likely to be under either house arrest or in temporary detention in Riyadh.
The leader of Lebanon's Hezbollah says the country's prime minister is currently detained in Saudi Arabia and that his "forced" resignation is unconstitutional because it was done "under pressure". The Saudi closure had drawn international condemnation and fears of a worsening humanitarian disaster in Yemen.
Saudi Arabia said Monday that the Saudi-led coalition fighting Shiite rebels in Yemen will begin reopening airports and seaports in the Arab world's poorest country, days after closing them over a rebel ballistic missile attack on Riyadh.
Saleh al-Sammad, the head of the Presidency Council of Yemen's rebels, also known as Houthis, told a rally of thousands of supporters marching down a main boulevard in the capital, Sanaa, that the coalition has "shut down all doors for peace and dialogue".
It says: "The first step in this process will be taken within 24 hours and involves reopening all the ports in areas controlled by" Yemen's internationally recognized government, which the coalition backs.
Hariri, a dual Lebanese and Saudi national whose family made a fortune in the kingdom, has made several official appearances since he stepped down, possibly in an attempt to dispel rumors his movements are restricted.
Abi Khalil said on Twitter that he signed a document on Friday calling on companies who submitted bids for the offshore licensee blocks "to negotiate the technical proposals".
His resignation on November 4 came on the same day that dozens of Saudi princes, senior ministers, businessmen were arrested in a purge carried out by a new anti-corruption committee led by Crown Prince Mohammed bin Salman.
Lebanon relaunched the tendering competition for the exploration and production rights in January after a three-year delay due to political paralysis.
Updates with Hariri remarks in second paragraph, analysts starting in fifth.
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