The actions underscore the continued unpredictability of US involvement in Iraq and Syria,and raise the possibility of an escalation with the militia. The Pentagon says the group has links to Iran's Quds Force,a special operations unit that US officials say provides weapons and other support to proxy forces that help Iran extend its reach.
"Iran and their KH proxy forces must cease their attacks on US and coalition forces,and respect Iraq's sovereignty,to prevent additional defensive actions by US forces,"Hoffman said.
The targets that US forces struck include three in Iraq and two in Syria,the Pentagon said. They include weapons storage facilities and locations the militia uses to plan attacks against coalition forces,Hoffman said.
The Iraqi military's Joint Operations Command said four fighters,including the deputy commander,were killed in US strikes on Kitaeb Hezbollah's headquarters along the Iraq-Syria border.
Jaafar al-Hussaini,a spokesman for the militia,said 19 fighters were killed and 35 were injured in the strikes."For those who ask about the response:it will be the size of our faith,"he said in a statement. Other sources put the number of militia fighters killed at 25,with at least 55 wounded.
At least four local Kataib Hezbollah commanders were among the dead,Iraqi security and militia sources said.
"We will not stand for the Islamic Republic of Iran to take actions that put American men and women in jeopardy,"US Secretary of State Mike Pompeo told reporters after briefing US President Donald Trump at his Mar-a-Lago club in Palm Beach,Florida.