A purported Taliban spokesman claimed the hard-line militia killed a second Korean hostage Monday because Afghanistan failed to release insurgents from prisons. Government officials said they hadn't recovered the body and couldn't confirm the claim. Meanwhile, the Al-Jazeera TV channel showed a video Monday of some seven South Korean female hostages. They did not speak as the shaky hand-held camera filmed them crouching with veiled heads in the dark, eyes closed or staring at the ground. The pan-Arab satellite station did not say how it obtained the video, and its authenticity could not immediately be verified. Militant spokesman Qari Yousef Ahmadi said senior Taliban leaders decided to kill the male captive because the government had not come through on promises to release Taliban prisoners.