Attacks on Saudi Arabia Tuesday claimed by Yemen's Houthis wounded more than 70 people and ignited fires at several oil facilities and utilities in the kingdom's southern region, authorities said, in a major escalation in the renewed conflict between an important US ally and the Iranian-backed rebels. The attacks come after weeks of escalating clashes between the Houthis and Saudi-backed government forces in Yemen, which shattered a four-year truce in the country's civil war. Key points and original sources are listed below.

• Attacks on Saudi Arabia Tuesday claimed by Yemen's Houthis wounded more than 70 people and ignited fires at several oil facilities and utilities in the kingdom's southern region, authorities said, in a major escalation in the renewed conflict between an import...S1

• The attacks come after weeks of escalating clashes between the Houthis and Saudi-backed government forces in Yemen, which shattered a four-year truce in the country's civil war.S2

• The flare-up delivered a new jolt to a region already destabilized by nearly three years of wars and brings more uncertainty for the global economy.S3

• Houthi attacks have ignited fires at several oil facilities and utilities in Saudi Arabia’s southern region and wounded more than 70 people.S4