Saudi ArabiaRegional Sunni power Saudi Arabia participated in or supported US-led military action against IS targets in Syria, launched for the first time on 23 September, according to the US defence department.
The Saudi government had earlier hosted an international meeting at which regional states vowed to "do their share" to combat IS.
Riyadh also agreed to a US request to provide a base to train moderate Syrian rebel forces. The kingdom has been a key supporter of the rebels, including hardline Islamist groups, but it has rejected an Iranian accusation that it has directly supported IS. However, wealthy Saudis have sent donations to the group and some 2,500 Saudi men have travelled to Syria to fight.
The Saudi authorities are concerned that IS will inspire Saudi jihadists to challenge the monarchy's legitimacy and seek to overthrow it.
In July, Riyadh deployed 30,000 troops to beef up security along its border with Iraq, and the following month hosted Iran's deputy foreign minister as the two regional rivals agreed to co-operate.
The Saudi government had earlier hosted an international meeting at which regional states vowed to "do their share" to combat IS.
Riyadh also agreed to a US request to provide a base to train moderate Syrian rebel forces. The kingdom has been a key supporter of the rebels, including hardline Islamist groups, but it has rejected an Iranian accusation that it has directly supported IS. However, wealthy Saudis have sent donations to the group and some 2,500 Saudi men have travelled to Syria to fight.
The Saudi authorities are concerned that IS will inspire Saudi jihadists to challenge the monarchy's legitimacy and seek to overthrow it.
In July, Riyadh deployed 30,000 troops to beef up security along its border with Iraq, and the following month hosted Iran's deputy foreign minister as the two regional rivals agreed to co-operate.