North Korea fired about 10 short-range ballistic missiles from its eastern coast on Thursday afternoon, according to the South Korean Joint Chiefs of Staff. The missiles traveled roughly 186 miles before falling outside Japan’s exclusive economic zone, the Japanese Ministry of Defense said.

The launches occurred a day before the scheduled conclusion of the Ulchi Freedom Shield joint military exercise, which the U.S. and South Korean forces had been conducting since Monday. The exercise, one of two major annual drills involving U.S. and South Korean troops, had been planned to run through August 27 but was announced to end after five days on Wednesday, following a directive from President Donald Trump to reduce joint training. Trump described the exercise as “very insulting” to North Korean leader Kim Jong Un, who he said had been “very well-behaved.” Kim Yo Jong, the sister of Kim Jong Un and head of the Workers’ Party’s general affairs, criticized the reduction as “unworthy of comment” and said the exercise demonstrated the United States’ unchanged hostile policy.

South Korean and U.S. officials said they were still analyzing the missile flight data and coordinating with Japan on the incident. The Joint Chiefs noted that the missile activity was being tracked by intelligence authorities and that the combined defense posture remained ready to respond to any provocation.