In addition to placing a political and economic blockade, the countries placed 71 Qatar-funded or Qatar-based individuals and organisations on a ban list because of alleged links to Qatar over terrorism.
Saudi Arabia, Egypt, UAE, and Bahrain, announced in a joint statement overnight placing new Libyan entities on the black list - the list of terrorist organisations funded by Qatar - as part of what they described their commitment to fighting terror.
Still, with some hope of a deal being at least plausible, Turkey's President Erdogan made the rounds in the Persian Gulf over the weekend, trying to mediate some sort of deal. He returned to Turkey, apparently in failure, with no signs anything really got worked out.
Last month, the four Arab states severed diplomatic ties and transport links with Qatar, accusing the oil-rich Gulf state of supporting terrorism and meddling in their internal affairs.
"The four countries also affirm the continuation of their current measures, and possible future measures that might be taken, until the Qatari authorities are committed to fulfilling all the just demands, which ensure countering terrorism and maintaining security and stability in the region", the statement said. Saudi-led block has accused the listed individuals of assisting the terrorist groups Jabhat al Nusra and Al Qaeda.
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The new list includes six Libyan entities - majority media agencies and TV channels.
The four Arab states want Qatar to reduce ties with their arch-foe Iran, close down a Turkish military base and shut the Al Jazeera TV channel, which they view as critical.
The joint statement strongly criticized Qatar's anti-terrorism laws, noting that recent measures adopted by Doha in this regard - including a joint memorandum of accord with the United States - were not enough.
Doha refused to accept those demands.