Norway"s foreign minister said on Thursday it was deliberating how to respond to a U.S proposal on forming an international mission to safeguard shipping in the Gulf. Speaking at a joint news conference with her Iranian counterpart, Eriksen Soereide said the government was "considering a number of different measures" and would make an assessment based on information it gathered. So far, Britain, Australia and Bahrain have joined the U.S.-led security mission to protect merchant vessels travelling through the Strait of Hormuz, a vital gateway for global oil supplies.