US airspace closures, lack of answers deepen East Coast drone mystery

Feds insist they still don't know what's happening – but note sightings cluster around airport flight paths

Analysis  Mystery drone fever continues to grip the US East Coast – and appears to be moving inland – as elected officials beg the federal government to do something. Meanwhile the feds reiterate what they've been saying all along: We don't know what's going on, but you all need to calm the hell down. …