"Qatar's demands to internationalize the holy sites is aggressive and a declaration of war against the kingdom," Adel al-Jubeir was quoted saying on Al Arabiya's website.
Qatar changes anti-terror law amid Gulf row
"We reserve the right to respond to anyone who is working on the internationalization of the holy sites," he said.
Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman al-Thani said no official from his country had made such a call.
"We are tired of responding to false information and stories invented from nothing," Sheikh Mohammed told Al Jazeera TV.
Erdogan plans Gulf visit to discuss Qatar dispute
Qatar did accuse the Saudis of politicizing hajj and addressed the United Nations Special Rapporteur on freedom of religion on Saturday, expressing concern about obstacles facing Qataris who want to attend hajj this year.
Saudi Arabia, the United Arab Emirates, Egypt and Bahrain previously issued a list of 13 demands for Qatar, which included curtailing its support for the Muslim Brotherhood, shutting down the Doha-based Al Jazeera channel, closing a Turkish military base and downgrading its relations with Gulf enemy Iran.
On Sunday, foreign ministers of the four countries said they were ready for dialogue with Qatar if it showed willingness to tackle their demands.
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