Bahrain's foreign ministry has summoned Iran's charge d'affaires in Manama to protest at what it described a "gross violation of its sovereignty".
It follows official Iranian calls for demonstrations against a proposed union between Saudi Arabia and Bahrain.
A summit of the Gulf states discussed the proposal on Monday but did not reach any decision on the matter.
Bahrain's Sunni royal family has accused Iran of supporting mass protests by the nation's Shia majority.
The proposed union was presented as a first step in a larger integration between all six Gulf Co-operation Council (GCC) members.
It calls for economic, political and military co-ordination and a new decision-making body based in Riyadh, replacing the current GCC Secretariat.
After no agreement was reached, the Saudi foreign minister said the discussions were being postponed.
But the mere sug
In: World News, Politics, Iran, Other Middle East, Religion
Tags: saudi arabia, sunni, bahrain, iran, shia, tensions, union, war, row, islam, middle east
Location: Bahrain (load item map)
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