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The emergency meetings in Mecca come just as the United States plans to beef up its troops in the Gulf after attacks on oil assets there, which it blames on Tehran.
Qatari forces participated in joint military exercises that ended in Saudi Arabia this week, in an apparent sign of some compromise among U.S.-allied Arab states locked in a nearly year-long dispute.
Saudi officials say almost two million pilgrims have arrived from abroad for the annual haj.
The Salwa border between Qatar and Saudi Arabia for pilgrims travelling to Mecca for the Hajj in the first sign of compromise in a long-running diplomatic stand-off.
Foreign ministers from Saudi Arabia, Egypt, the United Arab Emirates (UAE) and Bahrain said they are ready for a dialogue with Qatar if it shows a willingness to fight terrorism.
The Emir of Qatar says his country is ready for dialogue to resolve a diplomatic crisis with a Saudi-led group, but stressed that any solution must respect national sovereignty.
Adel Al-Jubeir added that "The Qataris know exactly whats required from them" to stop the current crisis
The United Arab Emirates was not responsible for an alleged hack of Qatari websites, the UAE's minister of state for foreign affairs said on Monday.
French foreign minister in Qatar for talks
Qatar and US sign deal to cooperate over combating terrorism funding but Doha's critics keep up their sanctions
The four Arab states leading the boycott against Qatar say its refusal to meet their demands represents a threat to regional security.
Qatar crisis: Gulf neighbours to continue boycott after Doha's "negative " response to ultimatum
Saudi Arabia and its allies meet to discuss whether to continue with the sanctions they imposed on Qatar on claims it supports terrorism.
A closer look at the 13 demands made by the four Arab states.
Qatar says its sovereignty is at stake and that it won't shut down the Al Jazeera satellite channel.
The Turkish President was voicing his strongest support yet for Qatar, accused by four Arab states of supporting terrorism.
Turkey’s defence minister says his country has no plans to review its military base in the Persian Gulf state of Qatar.
Fikri Isik’s comments come