Oil prices rose again Friday after Washington signaled it would soon intensify pressure on Tehran with “measures like have never been seen in the history of economic isolation on a country.”

The U.S. Army announcing a “temporary stand-down” of all Apache helicopter training flights, saying it will remain in effect until they have a “better understanding of the root cause of the accident.”

The U.S. Army is investigating after an Apache helicopter crashed Wednesday in central Texas, killing both crew members on board and sparking a wildfire.

The crash led to a grass fire, leading to closures on FM-2843.