Here’s a local article with a bit more information:
https://www.hawaiinewsnow.com/2019/06/22/authorities-responding-reports-possible-plane-crash-north-shore/
Thanks. With video:
Witness said it was hard to see crash knowing people lost their lives
https://www.khon2.com/news/local-news/witness-knew-that-something-was-not-right-shortly-before-crash-in-mokuleia/2092535411