Warning shots fired after two days raise suspicions of pirates . Boats were attacking a US Navy patrol ship . Warning shots land in water and boats turn away , CNN says . `` It is clear they were not following the international rules of the road observed by mariners around the globe , '' it said . Pirates known to be just off African nation of Somalia .
Warning shots fired after two days raise suspicions of pirates . Boats were attacking a US Navy patrol ship . Warning shots land in water and boats turn away , CNN says . Pirates known to be just off African nation of Somalia .