Attacks were the deadliest in Saudi Arabia since the kingdom and allied forces in Yemen launched a major military offensive against Houthi rebels last weekend The escalating violence has brought the conflict in Yemen to the doorstep of the Saudi capital, and the kingdom has no easy options to curtail the increasingly sophisticated and targeted strikes. Key points and original sources are listed below.

• Attacks were the deadliest in Saudi Arabia since the kingdom and allied forces in Yemen launched a major military offensive against Houthi rebels last weekendS1

• The escalating violence has brought the conflict in Yemen to the doorstep of the Saudi capital, and the kingdom has no easy options to curtail the increasingly sophisticated and targeted strikes.S2

• Saudi Arabia said on Friday that three people were killed including a pilot, in attacks on Riyadh’s international airport, after Yemen’s Houthis claimed a series of attacks targeting the facility. The conflict between the Houthis and Yemen’s Saudi-backed gover...S3