BAGHDAD - The United States-led international coalition fighting Islamic State estimates that fewer than 3,000 fighters belonging to the hardline Sunni militant group remain in Iraq and Syria, its spokesman said on Tuesday.

Islamic State's self-proclaimed caliphate has crumbled this year in Syria and Iraq, with the group losing the cities of Mosul, Raqqa and swaths of other territory.

“Current estimates are that there are less than 3,000 #Daesh fighters left — they still remain a threat, but we will continue to support our partner forces to defeat them,” U.S. Army Colonel Ryan Dillon tweeted, using an Arabic acronym for Islamic State.

Dillon’s tweet was part of his responses to an online question and answer session in which he also said the coalition had trained 125,000 members of Iraqi security forces, 22,000 of which were Kurdish Peshmerga fighters.

When asked if the United States planned to build permanent military bases in Iraq or Syria with the defeat of Islamic State, Dillon said it would not. “No — the Government of #Iraq knows where and how many from Coalition are here to support operation to defeat #Daesh; all bases are #Iraqi led,” he tweeted.