The U.S. Air Force dropped more bombs on the Islamic State terror group in June than any time in the past seven months.

In all, the U.S. released more than 3,000 weapons on ISIS in Iraq and Syria last month, according to Air Force Central Command. It's the third-highest monthly total since the air war began nearly two years ago.

In June, U.S. airstrikes helped Iraqi forces liberate Fallujah from the terror network. A convoy of 500 vehicles carrying ISIS fighters was destroyed trying to escape the city.

Pentagon Press Secretary Peter Cook said Defense Secretary Ash Carter wanted to pick up the pace.

Carter this week was set to host a meeting at Joint Base Andrews in Maryland convening international defense ministers whose countries were fighting ISIS.

In Iraq, firebrand Shiite cleric Muqtada al-Sadr called on his Iranian-backed forces to attack U.S. troops. "Obviously, it's a concern if anyone's threatening U.S. forces, but it's something we prepare for," Cook responded.

Al-Sadr's forces killed hundreds of American troops during the Iraq war.

Fox News' Lucas Tomlinson contributed to this report.