The Cairo-based Arab League called on the international community to oppose what it considers an "unjust decision" and the ongoing "Israeli occupation" of the city.
It called the move a "blatant attack on the feelings of Arabs and Muslims," and a "grave violation of the rules of international law" that would destabilize the region.
Egypt's Al-Azhar religious institution called on the international community to use "all peaceful means" to "dismiss positions of countries that sided with the Zionist entity," referring to Israel.
The US is to formally inaugurate the embassy in Jerusalem later on Monday.
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