All that is known right now is encapsulated in these tweets.

North Korea has launched a missile of indeterminate type.

(URGENT) N. Korea appears to have launched missile: NHK https://t.co/6kQdUHZBfP

— Yonhap News Agency (@YonhapNews) July 28, 2017

MORE: Pentagon says it has detected a ballistic missile launch from North Korea. https://t.co/bD75q22hLg

— Reuters (@Reuters) July 28, 2017

US officials detected the #DPRK launch at 10:45EDT. Type of missile fired still being evaluated. https://t.co/nI7PVCl74H

— Steve Herman (@W7VOA) July 28, 2017

It was not conducted according to established procedure

I'll have to check records, but an evening missile test is relatively unusual for North Korea. Majority occur in daylight hours.

— Martyn Williams (@martyn_williams) July 28, 2017

And it seems to have landed in a swath of ocean inside Japan’s economic development zone.

Japanese broadcaster NHK reports North Korea's apparent missile may have landed in Japan's exclusive economic zone

— Sky News Breaking (@SkyNewsBreak) July 28, 2017

JUST IN: Japan Prime Minister Abe convening emergency meeting after North Korea launches missile. https://t.co/XXzexvHPqe pic.twitter.com/E30Q79clMk

— Reuters (@Reuters) July 28, 2017

None of this is particularly good news.