WASHINGTON —

A massive and well-planned operation by the Islamic State to free thousands of the terror group’s fighters from a prison in northeastern Syria is over, more than six days after the attack plunged the facility and surrounding neighborhoods into chaos.

The U.S.-backed Syrian Democratic Forces (SDF) announced Wednesday they had taken full control of the al-Sina’a prison in Hasakah, a make-shift detention facility that housed an estimated 4,000 IS fighters, as well as about 700 to 850 boys and teenagers from IS families.

“The Peoples’ Hammer Operation has culminated with our entire control of the al-Sina’a prison in al-Hasakah and the surrendering of all Daesh terrorists,” SDF spokesman Farhad Shami tweeted, using the Arabic acronym for the terror group.

Prior to the announcement, SDF officials said overnight operations had freed an additional 23 workers from the prison who were being held as hostages, and that at least 1,000 prisoners had surrendered or had been recaptured.

Shami told VOA that 250 IS attackers had been killed, and that thousands of the prison’s inmates had been recaptured, according to initial estimates.

“Had the safety of the children not been our major concern, we could have finished this operation in one to two days with heavy weapons,” he added.

Shami also said the SDF was looking into the fate of the children, who had been kept in a separate part of the al-Sina’a prison facility, acknowledging some were likely injured.

SDF officials said early on that IS attackers and prisoners had been using the children as human shields.

On Tuesday, Human Rights Watch said it had spoken to an Australian boy who had been caught up in the fighting, saying he had been wounded during the SDF effort to retake the prison and that he saw other boys shot and killed.

“I was just sitting in my cell and an explosion happened,” he told HRW. “I ran out with my friends and on the way my friends got killed in front of me a 14 year old, a 15 year old.”

HRW Associate Director Letta Tayler Wednesday called on the SDF to provide an update on the children, noting evidence heavy weaponry had been used in the operation to retake the prison.

“We deeply share your concerns about the safety and well-being of the children [sic],” the SDF responded. “We are doing our best to provide the most accurate information for the public in the earliest convenience.”

This was clearly part of a more deliberate campaign,” Colin Clarke, director of policy and research at the global intelligence firm The Soufan Group, told VOA. “It’s not one that was designed overnight.”

“We’re going to see more sophisticated assaults, multi-pronged attacks against vulnerable prisons until ISIS feels like it’s recouped and restocked its organization with the requisite amount of fighters,” he added.

Humanitarian groups are also expressing alarm, though many agree the deadly IS prison break should not come as a surprise.

“I do strongly hope that this will serve as a wake-up call, drawing renewed attention to a situation that is totally unsustainable,” Dominik Stillhart, the director of operations for the International Committee of the Red Cross, told reporters Wednesday.

“What is happening in the northeast of Syria, with this essentially stranded population — not just the 10,000 people living in places of detention, but also the nearly 60,000 that are in the camps, in particular al-Hol — is not a sustainable solution,” he said. “Obviously, it is also a place that is fertile ground for further radicalization.”

The SDF Wednesday called on the international community to help, both with prisons and with repatriation of foreign IS fighters.

“We urgently need new prisons, larger, safer and far from residential areas,” the SDF’s Farhad Shami told VOA. “These prisons [in Hasakah] are no longer useable … this is almost an urgent matter now.”

In a statement Sunday, the U.S.-led coalition said the IS attack “attempted to destroy a new, more secure detention facility in Hasakah” being built not far from the current prison “but failed.”

On Wednesday, Coalition Commander, Major General John Brennan, admitted more work needs to be done to contain the reemerging threat from IS.

“This is not a problem solely within this city,” Brennan said in a statement. “The makeshift prisons throughout Syria are a breeding ground for Daesh’s failed ideology… This is a global problem that requires many nations to come together to develop an enduring long-term solution.”

Source: Voice Of America