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US Vice President Mike Pence on Monday warned North Korea not to test the resolve of the US “or the strength of our military forces,” following a failed North Korean missile test.

North Korea flexed its missile muscle at its annual military parade on Saturday, showing off an arsenal that included two new intercontinental ballistic missiles. The parade marked the “Day of the Sun,” celebrating the birthday of the country’s founder, Kim Il Sung. It took place the day before an attempted missile launch failed.

A South Korean defense official said the action took place in Sinpo, a port city in eastern North Korea. That was the site of a ballistic missile test earlier this month in which the projectile fell into the Sea of Japan, also known as the East Sea.

The North Koreans use Sinpo shipyard for their submarine activity, and US satellites have observed increased activity there in April, a US official said at the time of the previous test.

South Korean and US intelligence officials are trying to determine what type of missile was used Sunday, but initial reports said it could be a medium-range missile, according to a White House foreign policy adviser.