Britain summoned Iran's ambassador to the Foreign Office on Monday after an attack on a merchant vessel off the coast of Oman.
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James Cleverly, the minister for the Middle East, summoned Mohsen Baharvand in response to the attack on MV Mercer Street on Thursday, which killed a British national and Romanian.
"Minister Cleverly reiterated that Iran must immediately cease actions that risk international peace and security, and reinforced that vessels must be allowed to navigate freely in accordance with international law,'' the Foreign Commonwealth & Development Office said in a statement.
The United States, the UK and Israel have alleged that Iran carried out the fatal drone strike on the oil tanker, though Tehran denied involvement in the attack.
