No Terrorist Groups Took Credit for Downing EgyptAir Flight 804. So Experts Have Other Theories

Perhaps clarity on EgyptAir Flight 804 will surface with the black box, which reports say sensors have located on the Mediterranean floor. But a week after the airliner went down, from what experts and government officials from Cairo to Washington continue to say was very likely a terrorist attack, no terrorist group has taken responsibility.

That's unsettling all by itself. ISIS and al-Qaeda, the big global terror powers, tend to make their claims promptly.