RIYADH (AFP) — Oil-rich Arab monarchies in the Gulf chided Iran on Saturday for setting up facilities on an island claimed by the United Arab Emirates, two days after Abu Dhabi protested to Tehran over the move.Gulf Cooperation Council secretary general Abdurrahman al-Attiyah "strongly denounced Iran's opening of two administrative offices on Abu Musa island, which belongs to the UAE and is occupied by Iran," a GCC statement said.The Iranian measure constitutes an "illegitimate action on an indivisible part of the UAE," he said, calling for it to be revoked.The Riyadh-based pro-Western GCC groups Bahrain, Kuwait, Oman, Qatar and Saudi Arabia alongside the UAE.Attiyah renewed the GCC's support for the UAE's "full sovereignty" over Abu Musa as well as over Greater Tunb and Lesser Tunb -- two other strategic Gulf islands controlled by Iran and claimed by Abu Dhabi.