Gold prices rose for a fifth consecutive session on Tuesday, as investors sought safe-havens amid an escalating US and Israeli air war against Iran , raising fears the ​conflict could spiral into a protracted regional war and deepen uncertainty. Spot ‌gold was up 1% at $5,377.21 per ounce, as of 0122 GMT. In the previous session, bullion climbed to its highest point in more than four weeks after the U.S. and Israel launched strikes ​on Iran over the weekend. US gold futures for April delivery were ​up 1.5% at $5,391.90. The dollar hovered close to a more than five-week ⁠high reached on Monday, supported by firm demand and cautious market sentiment. A stronger ​greenback typically makes dollar-denominated assets such as bullion more expensive for other currency holders. ​But in crisis conditions, gold trades more as a risk hedge than as a currency alternative. Iranian media reported that a senior official from the Islamic Revolutionary Guards said on Monday the Strait of ​Hormuz has been closed and warned that Iran would fire on any ship trying ​to pass through the strategic waterway. This is Iran’s most explicit warning since telling ships it ‌was closing ⁠the export route on Saturday, a move that threatens to choke a fifth of global oil flows and send crude prices sharply higher. US President Donald Trump said that he ordered the attack on Iran to thwart what he described as imminent threats from Tehran’s ​nuclear and ballistic missile ​programmes, vowed to ⁠pursue the conflict for as long as necessary, while warned a “big wave” of further attacks was coming soon, without providing specific details. The attack on Iran has pitched the Gulf into war, ​killed scores ⁠of civilians in Iran, Israel and Lebanon, thrown global air transport into chaos and shut down shipping through the Strait of Hormuz. Spot silver rose 1.4% to $90.67 per ounce on ⁠Tuesday, after ​climbing to a more than four-week high in ​the previous session. Spot platinum added 0.6% to $2,316.50 per ounce, while palladium gained 1.6% to $1,795.08.