Four Arab states have sent Qatar a list of 13 demands it must meet if it wants them to lift their sanctions.
Saudi Arabia, Egypt, the United Arab Emirates (UAE) and Bahrain are asking the Gulf state to shut down its broadcaster, Al Jazeera.
They are also asking Qatar to reduce ties with Iran and close a Turkish military base - all within 10 days.
Qatar, which sought to raise its profile in recent years, denies funding terrorism and fostering instability.
It has been subjected to more than two weeks of unprecedented diplomatic and economic sanctions, in the worst political crisis among Gulf countries in decades.
There was no immediate response from Qatar but Foreign Minister Sheikh Mohammed bin Abdulrahman al-Thani said earlier that it would not negotiate until the punitive measures were lifted.
He also denied his country supported "any terrorist organisation".
According to the Associated Press news agency, which obtained a copy of the list, Qatar must also:
An unnamed official from one of the four countries told Reuters news agency that Qatar was also being asked to sever links with so-called Islamic State, al-Qaeda and Lebanese Shia militant group Hezbollah.
According to the document seen by AP, Qatar is being asked to shut down diplomatic posts in Iran, expel any members of Iran's elite Revolutionary Guard and only conduct trade with Iran that complies with US sanctions.
The demands have not been officially unveiled. Their publication has increased the friction between the two sides.
Anwar Gargash, the UAE's state minister for foreign affairs, accused Qatar of leaking the details, saying it was "an attempt to abort the mediation in a childish act that we have grown accustomed to from our brother".