Saudi energy minister Prince Abdulaziz bin Salman said recent events had put the kingdom’s infrastructure, institutions, people and resilience to the test, requiring a serious response. (EPA Images pic)RIYADH: Saudi Arabia's energy minister on Monday said the country had been tested but would mount a "serious" response after a string of attacks on Riyadh's international airport by Yemen's Houthis that left 18 people dead.

Lethal airport strikes since last week have rocked the world's top oil exporter, which is pursuing an expensive economic reform drive aimed at attracting foreign investment.

Yemen's civil war, where a Saudi-led military coalition supports the government against the Iran-backed Houthis, has reignited months into the US-Iran conflict that has roiled energy markets and plunged the Middle East into crisis.