North Korea attempted a missile launch Sunday morning local time (5:21pm ET), but it failed "almost immediately" United States military officials confirmed to NBC News.

South Korea's military detected the same results, according to South Korea's Yonhap news agency.

The launch was attempted from Sinpo, a city on North Korea's east coast, some 400 miles from Japan,according to U.S. Pacific Command.

Early assessments suggested the projectile was not an intercontinental ballistic missile (ICBM) capable of reaching the continental U.S., two U.S. military officials told NBC News.

The attempted launch comes just one day after the North held a massive parade to display is military might, including what experts said included new capabilities for long-range ICBMs.

Related: North Korea Parades New Missile Launch Capability, Experts Say

President Donald Trump, who is at his Mar-a-Lago resort in Palm Beach, Florida, this weekend, was briefed on the launch, a senior White House official told NBC News.

"The president and his military team are aware of North Korea's most recent unsuccessful missile launch. The president has no further comment," Secretary of Defense James Mattis said in a statement Saturday night.

"U.S. Pacific Command is fully committed to working closely with our allies in the Republic of Korea and in Japan to maintain security," the military said in an earlier statement on Saturday.

Vice President Mike Pence was en route with his wife and two daughters to Seoul, South Korea, Tuesday night for meetings with U.S. and South Korean troops and acting President Hwang Kyo-ahn. Pence's schedule was not expected to be altered, a senior White House officials said.

Shin In-kyun, President of Korea Defense Network a civic group specializing in military affairs, told NBC News that Sinpo is North Korea's submarine port and the failed missile was likely a submarine-launched ballistic missile (SLBM).

"SLBMs are more threatening than any other type of missile of the same range because it can evade radar detection, including the THAAD," Shin said, referring to the Terminal High Altitude Area Defense anti-missile system provided to South Korea by the U.S. "If North Korea [can] complete building 3,000-ton submarine, they can then attack Guam, Hawaii and even Alaska with an SLBM."

South Korea's National Security Council was set to convene Sunday morning local time (8:30 p.m. ET) "to examine the security situation regarding the missile launch by North Korea," a South Korean presidential spokesperson told NBC News.

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