The US military has launched its first air strikes against Isis militants in Syria supported by a coalition of five Arab states, the Pentagon confirmed on Tuesday.
Syrian state television reported on Tuesday that Washington informed Syria's United Nations envoy before the attacks began, quoting Syria's Foreign Ministry as the source. However, Syria did not formally consent to them taking place in its territory.
Here are the major developments so far:
The wife of Alan Henning, the British aid worker being held by Isis, has received an audio message of her husband "pleading for his life".
The Pentagon spokesman Rear Adm John Kirby said fighter jets, bombers and Tomahawk cruise missiles were fired from ships in the region during the strikes.
Syrian Twitter user Abdulkader Hariri apparently live-tweeted the US attacks 30 minutes before the Pentagon broke the news.
President Obama said the US launched strikes against the al-Qaeda linked Khorasan group, hours after the military confirmed it attacked a second terrorist group plotting an “imminent attack against America and Western interests” in Syria.
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Britain was not involved in the strikes but the Ministry of Defence (MoD) said discussions on whether to join the strikes in Syria are “ongoing” and "no decision has been taken to our involvement".