The New York Times reports:

An audacious attack on a prison housing thousands of former ISIS fighters in Syria. A series of strikes against military forces in neighboring Iraq. And a horrific video harking back to the grimmest days of the insurgency that showed the beheading of an Iraqi police officer.

The evidence of a resurgence of the Islamic State in Syria and Iraq is mounting by the day, nearly three years after the militants lost the last patch of territory of their so-called caliphate, which once stretched across vast parts of the two countries. The fact that ISIS was able to mount these coordinated and sophisticated attacks in recent days shows that what had been believed to be disparate sleeper cells are re-emerging as a more serious threat.

“It’s a wake-up call for regional players, for national players, that ISIS is not over, that the fight is not over,” said Kawa Hassan, Middle East and North Africa director at the Stimson Center, a Washington research institute. “It shows the resilience of ISIS to strike back at the time and place of their choosing.”

On Tuesday, fighting between a Kurdish-led militia backed by the United States and the militants spread from the embattled Sinaa prison in northeastern Syria to surrounding neighborhoods, swelling into the biggest confrontation between the American military and its Syrian allies and ISIS in three years. [Continue reading…]