A US Navy submarine and an American amphibious ship have collided in the Strait of Hormuz.
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The stretch of water is between Iran and the Arabian peninsula.
According to the navy's Bahrain-based 5th Fleet, the vessels were submerged when they crashed.
Fifteen soldiers aboard the USS Hartford submarine were slightly injured but able to return to duty.
No injuries were reported on the amphibious ship, the USS New Orleans.
But the ship suffered a ruptured fuel tank, which resulted in an oil spill of approximately 25,000 gallons of diesel.
The damage to both vessels is still being evaluated.
Both ships are currently operating under their own power. The crash is currently under investigation.
The Navy said both ships were on regularly scheduled deployments to the region and conducting security operations.
Officials said the collision happened about 1am local time.