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Saudi and wider Gulf stock markets opened lower after the Houthis claimed strikes on Riyadh.
The Saudi benchmark fell 0.5 percent, led by declines in Saudi Aramco and Saudi National Bank.
Qatar's main index fell 0.9 percent.
One report said flames and smoke were visible near Riyadh's main airport after authorities issued safety alerts.
Why it mattersIt shows how renewed strike claims can shake regional markets and raise escalation risk.
More context
Another report said Saudi authorities stated they intercepted an attack attempt and that no casualties or damage were reported.