'Around 100' US special ops forces to deploy to Iraq to combat IS: official

US soldiers stand guard at the Taji base complex which hosts Iraqi and US troops and is located thirty kilometres north of the capital Baghdad on December 29, 2014 (AFP Photo/Ali Al-Saadi)

Washington (AFP) - The United States is sending about 100 commandos to Iraq to fight Islamic State jihadists in that country and across the border in Syria, a US military spokesman said Wednesday.

"Probably around 100, maybe a little bit less," Colonel Steve Warren said. "In fact, really fewer actual trigger-pullers, if you will ... It's a very small number, a double-digit number."

Warren's comments came the day after Defense Secretary Ashton Carter announced additional special forces troops would join the fight against the IS group, though the Pentagon chief did not give details on the size of the deployment.

Iraqi Prime Minister Haider al-Abadi reacted to Carter's announcement by saying Iraq does not need foreign ground troops to defeat the IS group, but he did not directly reject the deployment and US officials downplayed his remarks.

"We've been talking with the prime minister about this for weeks," Warren said.

The specially trained commandos will be involved in direct combat against IS jihadists, but the Pentagon insists their mission doesn't contradict a White House pledge to avoid US "boots on the ground" and did not constitute "mission creep" in which the United States gets incrementally bogged down in a ground war against the IS group.

This is not "ground combat with armor and artillery and combined armed operations and death and destruction everywhere you look," Warren said.

"These are raids, these are a small number of highly skilled commandos conducting very precise, very limited operations ... so there is a difference."

The United States already has about 3,500 troops in Iraq, but their mission is to "train and advise" local forces.