A U.S. military base in Afghanistan is coming under fire by Muslims for burning religious materials. More than 2,000 Afghans protested at the base, angry at the disposal.

FOX News Radio's Emily Wither reports:

It happened at Bagram air base, north of Kabul.

It appears these religious books were accidently sent to the trash heap for burning. Local workers at the dump site noticed the material.

U.S. Commander in the country General John Allen ordering an investigation in to the incident.

(Allen) "I promise you, this was not intentional in any way and I offer my sincere apologies for any offense this may have caused."

It's feared that this will only add to anti-foreign sentiment on the rise there.

In Jerusalem, Emily Wither, FOX News Radio

UPDATE:  A senior U.S. official confirms to FOX that the damaged books at Bagram were removed from the detention center library because they were found to contain extremist materials and many of the books also had markings suggesting the detainees were using them for clandestine communications.

This official said that the books were going to be burned until Afghans stepped in and said this was not the proper way to dispose of them. In the process some materials were damaged, which this official called a "breakdown in judgment, not a breakdown in our respect for Islam."

But it was right to remove them from the library this official said. "Materials of extremist nature were housed in this library and used for clandestine communications between detainees."

This official said he was not sure how the books made it in the library in the first place.

ISAF and Afghanistan are conducting a joint investigation into the entire incident.

The White House is also following this story closely.

Listen HERE to WH Press Secretary Jay Carney's comments on the incident:

Tune in to your local FOX News Radio affiliate for more on this developing story.