The Taliban released a video Friday showing a U.S. soldier captured more than five months ago in eastern Afghanistan.

Pte. 1st Class Bowe Bergdahl is the only known American serviceman in captivity. The U.S. airborne infantryman was taken by the Afghan Taliban in Paktika province on June 30.

This image from video frame released by the Taliban on Friday shows U.S. soldier Pte. 1st Class Bowe Bergdahl, who was captured more than five months ago in eastern Afghanistan. (Associated Press)

"This is a horrible act which exploits a young soldier, who was clearly compelled to read a prepared statement," said a statement from Gregory Smith, a U.S. navy rear admiral and spokesman for the NATO-led international force in Afghanistan that confirmed the man in the video is Bergdahl.

"To release this video on Christmas Day is an affront to the deeply concerned family and friends of Bowe Bergdahl, demonstrating contempt for religious traditions and the teachings of Islam."

Bergdahl is shown seated, facing the camera, wearing sunglasses and what appears to be a U.S. military helmet and uniform. On one side of the image, it says: "An American soldier imprisoned by the Mujahideen of the Islamic Emirate of Afghanistan."

The man identifies himself as Bergdahl, born in Sun Valley, Idaho, and gives his rank, birthday, blood type, his unit and mother's maiden name before beginning a lengthy verbal attack on the U.S. conduct of the war in Afghanistan and its relations with Muslims. He seems healthy and doesn't appear to have been abused.

The video, which has an English-language narration in parts, also shows images of prisoners in U.S. custody being abused. The speaker says he did not suffer such ill treatment.

Prisoner exchange demanded

A statement read by a Taliban spokesman, Zabihullah Mujahid, appears at the end of the video and renews demands for a "limited number of prisoners" to be exchanged for Bergdahl. The statement says that more American troops could be captured.

The Geneva Conventions, which regulate the conduct of war between regular armies, bar the use of detainees for propaganda purposes and prohibit signatories from putting captured military personnel on display. As an insurgent organization, the Taliban are not party to the treaty.

Statements from captives are typically viewed as being made under duress. The insurgents also released a video of Bergdahl a few weeks after he was captured. In the July 19 video, Bergdahl appeared downcast and frightened.

Bergdahl, who was serving with a unit based in Fort Richardson, Alaska, was 23 when he vanished just five months after arriving in Afghanistan. He was serving at a base in Paktika province near the border with Pakistan in an area known to be a Taliban stronghold.

U.S. military officials have searched for Bergdahl, but it is not publicly known whether he is even being held in Afghanistan or neighbouring Pakistan.