In the strange genre of "Here's what we know" Vox journalism, the only relevant statements are narrowly circumscribed descriptions of an event, in this case the EgyptAir plane crash.
In fact, we know a lot of potentially relevant information. For example, the above is a photograph of equipment seized from an Al-Shabaab laptop bomb making factory in Mogadishu, Somalia 4 days ago. Al-Shabaab has already demonstrated that it can get a laptop bomb on a plane, using trickery involving the security screening of a disabled passenger. Furthermore, Islamist terrorist groups cooperate and compete with each other. Hopefully, crash investigators aren't sticking to the latest rules of "serious" journalism.