North Korea on Saturday fired about 10 ballistic missiles toward the eastern sea, South Korea’s military said, staging its own show of force as the rival South conducts a joint military exercise with the United States.

Japanese Defense Minister Shinjiro Koizumi said the weapons landed outside the country’s exclusive economic zone and that there were no reports of damage to planes or ships. The South’s Joint Chiefs said the military has stepped up surveillance and is maintaining readiness against possible additional launches while closely sharing information with the US and Japan.