ISIS prisoners escaped from a northeastern Syria prison and some remain unaccounted for after chaos made tracking impossible, according to Syria analyst Nanar Hawach.

The new regime seeks to crush a U.S.-backed Kurdish force.

The U.S. is moving ISIS detainees in the Middle East after a prison break. CBS News' Charlie D'Agata reports.

Some 150 fighters were moved Wednesday, but thousands more could follow as tensions flare between the Syrian government and a Kurdish-led militia.

The U.S. envoy to Syria said Washington was confident the Syrian government could take over the country’s fight against the Islamic State terrorist group.

The United Nations said on Thursday it was taking management responsibility for vast camps in Syria housing tens of thousands of women and children associated with Islamic State, after the rapid collapse of Kurdish-led forces who guarded them for years.

The transfer of ISIS detainees to the more secure Iraq is intended to prevent them from breaking out during government-Kurd fighting.

U.S. forces moved 150 ISIS detainees from Syria to Iraq as CENTCOM began a transfer operation involving up to 7,000 radical prisoners.