North Korea fired four short-range ballistic missiles toward the Yellow Sea on Saturday, South Korean officials said, Bloomberg reported.

South Korea’s Joint Chiefs of Staff detected the launches from Tongrim County in North Pyongan Province between around 11:32 a.m. and 11:59 a.m. local time, it said in a statement.

The missiles flew about 130 kilometers at an apogee of 20 kilometers, and with a top speed of Mach 5.