North Korea fired four ballistic missiles off its eastern coast on Monday, a South Korean military official told NBC News.
The missiles were fired at about 7:36 a.m. Monday (5:36 p.m. Sunday ET) and traveled about 620 miles, the official said. They landed in the East Sea, also called the Sea of Japan, the official said.
South Korea's acting president, Hwang Kyo-ahn, called for an immediate meeting of the National Security Council's standing committee, a spokesman said.
Pyongyang on Friday threatened to conduct more missile tests in response to the two-month Foal Eagle exercise between Seoul and Washington, which continues through April.
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