Militants in Yemen have released a video threatening to execute a British-born American hostage in three days if its demands to the U.S. government are not met, according to a company that monitors terrorist groups.

The video from al Qaeda in the Arabian Peninsula (AQAP), which was purportedly released Thursday, does not specify what those demands are, SITE Intelligence Group said. But in a translation provided by the company, AQAP accuses the U.S. of bombing its fighters. In the video, a man the group claims is U.S. citizen Luke Somers is threatened with execution.

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