As you can see, the U.S. market was steadily growing the last 5 days. This exact moment will, of course, motivate investors to move back their money into the U.S. assets, what increases the demand for dollar. Moreover, yesterday’s FOMC report shows: the rate hike is coming soon, the Fed’s balance sheet to be eased (it has the same effect as rate hike does).
OPEC: Saudi Arabia says that it’s not necessary to cut the production enormously, so the oil drops in price and people are moving to the dollar assests.