The yen and other safe-haven currencies were in demand on Monday, along with assets such as gold, as investors fretted that the killing of Iran's most prominent military commander by the United States could trigger a broader Middle East conflict.

U.S. President Donald Trump warned of a “major retaliation” if Iran hit back, while Iran's replacement commander vowed to expel the United States from the region.

The Japanese yen surged on Monday to a three-month high of 107.77 versus the U.S. dollar in Asian trading and was last up 0.2% on the day at 108 .

The dollar was treading water versus six major currencies and was slightly weaker against the euro, with euro/dollar last up 0.1% at $1.1167.

Source : Reuters