The Houthis also recently warned airlines that Saudi airspace and airports remain unsafe. The Houthis have fired several missiles at Yemen's presidential palace complex. Key points and original sources are listed below.

• The Houthis also recently warned airlines that Saudi airspace and airports remain unsafe.S1

• The Houthis have fired several missiles at Yemen's presidential palace complex.S2

• Houthis fire missiles at Yemen palace in bid to wipe out Saudibacked govt killedS3