An unidentified projectile struck Terminal 4 at Riyadh airport, sparking a fire, a day after an attack killed at least 12 people and wounded more than 300. Sunday's strike came as the King Khalid International Airport remained closed following a deadly attack on Saturday, and after a warning from Houthi rebels in Yemen that "worse is yet to come." Key points and original sources are listed below.

• An unidentified projectile struck Terminal 4 at Riyadh airport, sparking a fire, a day after an attack killed at least 12 people and wounded more than 300.S1

• Sunday's strike came as the King Khalid International Airport remained closed following a deadly attack on Saturday, and after a warning from Houthi rebels in Yemen that "worse is yet to come."S2

• The attack comes a day after a strike by Yemen's Houthis killed 12 people and injued hundreds in the Saudi capital's airports.S3

• The Saudi-led coalition in Yemen said an "unidentified projectile" had targeted Riyadh's international airport on Sunday, causing a fire. The incident came hours after the Iran-backed Houthis warned airlines and travellers to stay away from Saudi airports. Dav...S4

• By Jana Choukeir, Maha El Dahan and Timour AzhariDUBAI/RIYADH, Oct 11 (Reuters) - The Saudi-led coalition in Yemen said an "unidentified projectile" had targeted Riyadh's international airport on Sunday, causing a fire, hours after the Iran-backed Houthis warn...S5