North Korea fired approximately 10 short-range ballistic missiles toward the East Sea (Sea of Japan) on Thursday morning, according to South Korea’s Joint Chiefs of Staff (JCS), a day after sending a barrage of balloons carrying trash over the border.

South Korean authorities said the DPRK launched the short-range ballistic missiles at 6:14 a.m. KST from the Sunan area in Pyongyang toward the East Sea. Sunan is home to North Korea’s international airport, which the country has often used to stage missile launches.

The North Korean missiles “flew approximately 350 km before landing in the East Sea,” according to JCS.