Following a late night car accident Saturday evening in which a U.S. sailor injured two Japanese civilians on Okinawa, the U.S. military has temporarily curtailed off-base liberty and banned all alcohol consumption for almost 20,000 U.S. sailors stationed in Japan.

The accident comes as relations between Washington and Tokyo are already strained over a previous incident in which a civilian contractor, who was a former a Marine, was arrested in connection with the suspected killing of a local.