It appears poor seamanship may have been the reason why the crews of two small American boats were taken into custody by the Iranians.

FOX's Jon Decker at the White House has more:

The Pentagon is confirming that the two Navy boats deviated from their planned course on their way to refueling.

What's still not known is what caused the change in course and why the boats entered into Iranian territorial waters.

The Defense Department also confirms that after armed Iranian military personnel boarded the two Navy boats, they were escorted by gunpoint to a small port facility on Farsi Island. There are no indications that the 10 sailors were physically harmed during their 15-hour detainment.

At the White House, Jon Decker, FOX News.