A video of the North Korean parade showed missiles and a possible successor to Kim Jong Un 1:30
(CNN) --
North Korea launched multiple unidentified ballistic missiles into the waters off the east coast of the Korean Peninsula, authorities said.
The Japanese Coast Guard said in a statement on its official website that North Korea launched three suspected ballistic missiles, however the South Korean Joint Chiefs of Staff said only two short-range ballistic missiles were detected.
South Korea said the missiles were fired from the Sukchon area of North Korea's South Pyongan province between 7 a.m. and 7:11 a.m. local time Monday.
Japan's coast guard issued an alert to ships on Monday morning local time, advising "to stay tuned for more information."
The agency also told the boats to stay away from the falling objects and to report any sightings to the coast guard.
Kim Yo Jong, the sister of North Korean leader Kim Jong Un and one of the country's top officials, issued a statement Monday at the time of the suspected missile launch.
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Kim, according to the statement that was published in the state media Korean Central News Agency (KCNA), said that North Korea has "satisfactory technology and capabilities" for missile re-entry and now all that remains is to "focus on increasing the number of missiles.
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"Instead of doubting or worrying about other people's technologies, it would be better to think more deeply about countermeasures to defend yourself," Kim said.
He also said that if North Korea considered the presence of US forces in the region a threat, it would take "corresponding measures," adding that "how often the Pacific Ocean is used as our firing range depends on the nature of United States military actions.
A day before the incident, North Korea acknowledged that it conducted a test of an intercontinental ballistic missile (ICBM) on Saturday, its third known test of the long-range weapon in less than a year.
The state-run Korean Central News Agency reported that a Hwasong-15 ICBM was fired in a "surprise mock ICBM launch" under the written orders of leader Kim Jong Un.
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The missile flew 989 km for nearly 67 minutes at an altitude of 5,768.5 km, according to the KCNA report.
He said the test was a showcase of Pyongyang's ability to launch a "fatal nuclear counterstrike against hostile forces" and "clear proof of the safe reliability of our powerful physical nuclear deterrent."
Saturday's test came after North Korea warned Friday of "unprecedented strong responses" if the United States and South Korea go ahead with planned military exercises.
Washington and Seoul are expected to hold nuclear simulation exercises this week at the Pentagon, South Korea's Defense Ministry said on Friday.
The allies are also expected to hold military exercises next month on the Korean peninsula.
CNN's Maija Ehlinger contributed to this report.
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