ISIS releases video showing apparent execution of 'British spies'

The Islamic State group has released a video in which they appear to be executing five men whom the terror organization acuses of being British spies.

An Islamic State militant can be seen with a pistol, and in a British accent says to viewers: "This is a message to (British Prime Minister) David Cameron." The militant calls Cameron an "imbecile" and a "slave of the White House."

The message comes amid British airstrikes on Islamic State held-territory in Syria.