Jordan said today it had launched air strikes against the Islamic State group, after vowing a harsh response to the burning alive of one of its fighter pilots.

"The Jordanian air force launched raids against positions of the Islamic State group," said a government official.

Jordanian fighter jets pounded hideouts of Islamic State militants in Syria and then roared over the hometown of a pilot killed by the militants as King Abdullah consoled the victim's family in the town.

A security source told Reuters news agency the strikes hit targets in the eastern province of Deir al-Zor and near Raqqa.

Jordan has conducted regular raids against IS in Syria as part of a US-led campaign against IS, which has seized swathes of the country and of neighbouring Iraq.

The murder of airman Muath al-Kasaesbeh, who was captured by IS when his F16 fighter plane went down in Syria in December, has boosted support in Jordan for increased military action against the jihadists.

Jordanian King Abdullah II personally paid his condolences today to the pilot's family in his hometown of Karak, 120km south of the capital.

King Abdullah cut short a visit to the United States and flew back to Amman yesterday after the harrowing video emerged of Mr Kassasbeh's killing.

"The blood of martyr Maaz al-Kassasbeh will not be in vain and the response of Jordan and its army after what happened to our dear son will be severe," he said afterwards.

Yesterday, Jordan executed two Iraqis on death row - female would-be suicide bomber Sajida al-Rishawi and Al-Qaeda operative Ziad al-Karboli - in response to the killing of the 26-year-old pilot.