Denmark will send seven F-16 fighter jets to help combat ISIL militants in Iraq, Prime Minister Helle Thorning-Schmidt has said.

"I am very pleased that there now is a broad coalition, including countries in the region who want to... contribute," she said at a press conference, adding that the Danish fighter jets would not join US planes in bombing targets in Syria.

The decision to take part in the campaign in Iraq is expected to receive the support of a majority in parliament and the F-16s could be dispatched next week. They will be deployed for 12 months.

"We were asked to contribute in Iraq, it fits well with what the coalition wants. With regards to Iraq we have a concrete request from the Iraqi government," Thorning-Schmidt said.

"The terror group ISIL is a terrible organisation that Denmark should help battle," she added.

The country had also been asked by the US to send troops to help train Iraqi and Kurdish security forces, she said.

"We don't have enough information about the training exercise yet to say who will contribute with (what), so at the moment we can't rule anything out," she said.

"What we can rule out is that they would take part in fighting while they are in Iraq," she added.

A US-led alliance launched fresh air strikes against ISIL in Syria on Friday as Britain weighed joining the aerial campaign in Iraq.

Both France and Britain have ruled out carrying strikes in Syria, unlike Arab allies taking part in the raids.

Belgium and the Netherlands also plan to send six F-16 fighter bombers to take part in the campaign in Iraq.