The US is keeping quiet about which countries are taking part in the fight against ISIS.
Secretary of State John Kerry told CBS that nearly 40 nations have agreed to contribute to the fight, but “it’s not appropriate to start announcing” what roles each will play.
However, an international conference on the ISIS situation took place in Paris on Monday, with world leaders set to debate the anti-ISIS coalition. The meeting includes representatives of some 30 countries, but excludes Iraq’s neighbors Syria and Iran.
Turkey and Jordan, key US allies in the region, are thought to be reluctant to intervene directly.
Turkey is a NATO member, and borders both Syria and Iraq from the north. Despite this, it won’t let the US use its facilities in the mission against the IS, a government official in Ankara told AFP.
Turkey was also absent during the signing of a joint communiqué on the situation in Iraq on Thursday.
The US State Department meanwhile praised The Netherlands for “leading an effort” to stop the foreign fighters supporting terrorism from arriving in the country.
Britain became the first country to officially join the military operation. UK Prime Minister David Cameron called IS “the embodiment of evil” on Sunday, following the group’s beheading of its third Western hostage, this time British citizen David Haines. Earlier, IS killed two US journalists in the same manner.
Germany, Australia, France and Canada are also part of the campaign.