Saudi Arabia confirmed it took part along with Arab allies in US-led air strikes against jihadists from the Islamic State group in Syria on Tuesday.
"The Saudi Royal Air Force participated in the military operations against IS in Syria, in support of the moderate Syrian opposition, and as part of the international coalition," a government spokesman said, quoted by the official SPA news agency.
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The coalition, he added, was formed to "eliminate terrorism, a deadly disease, and to support the brotherly Syrian people to restore security, unity and development in this stricken country".
The statement came after Bahrain and the United Arab Emirates also confirmed their warplanes had taken part in the US-led strikes against jihadists in Syria overnight.
The Pentagon said Qatar also took part in the military action.