Oil prices climbed on Thursday after Iraqi security officials said Iranian explosive-laden boats had hit two fuel oil tankers amid other global supply disruptions from the U.S.-Israeli war on Iran.

Brent futures rose $5.69, or 6.19%, to $97.67 a barrel at 0118 GMT, and U.S. West Texas Intermediate (WTI) crude was up $5.11, or 5.86%, to $92.36.

The U.S. dollar steadied on Thursday, but remains firmer compared to the start of the war in Iran, as investors fret over a renewed spike in oil prices.

By 06:03 ET (10:03 GMT), the U.S. dollar index, which tracks the greenback against a basket of rival currencies, had risen by 0.1% to 99.29. Meanwhile, the euro weakened slightly by 0.1% to $1.1558, while sterling edged down by 0.2% to $1.3388.

Bitcoin was higher on Tuesday, as risk appetite returned after President Donald Trump said the ongoing U.S.-Israeli war with Iran could be over soon.

The world’s largest cryptocurrency was last up 2.1% at $69,869.0 by 19:32 ET (23:32 GMT).

A rally in the U.S. dollar paused on Tuesday, as investors assessed hopes that the joint U.S.-Israeli assault on Iran could soon come to an end.

The Dollar Index, which tracks the greenback against a basket of six major world currencies, was last down 0.3% to 98.91 at 15:47 ET (19:47 GMT).