Qatar's foreign minister has rejected a list of 13 conditions set by four Arab states for lifting Sanctions, saying it is neither reasonable nor actionable.
Among other things, they have demanded the closure of Al Jazeera TV, which is funded by the Qatari government.
Al Jazeera accused them of trying to "silence freedom of expression".
Qatar has been under unprecedented diplomatic and economic sanctions for more than two weeks, with Iran and Turkey increasingly supplying it with food and other goods.
It denies accusations that it is funding terrorism and fostering regional instability.
The four countries also want Qatar to reduce its ties with Iran and close a Turkish military base, setting a deadline on Friday of 10 days.