A US Navy aircraft carrying 11 crew and passengers has crashed into the sea off the coast of Japan, south-east of Okinawa. <br/><br/>In a statement, Navy said a military aircraft with 11 people aboard has crashed into the ocean southeast of Okinawa. <br/><br/>It said the cause of crash is unknown and the names of the crew and passengers are being withheld. The aircraft was en route to the aircraft carrier USS Ronald Reagan in the Philippine Sea.<br/> <br/>The US Navy lost 10 personnel in August, when the USS John McCain collided with a tanker near Singapore.