Mr Penny said that it would have been difficult to incorporate the signals into a homemade bomb.
BBC: Jailed hoax bomber 'researched explosives' after release
An unmanned aircraft fired a missile at three men burying a homemade bomb, apparently killing two of them.
WSJ: Ahead of Marjah Offensive, Afghan Officials Sought to Negotiate With Taliban
In another recording, the men discussed how to make a homemade bomb, based on instructions available in an English-language jihadist magazine.
BBC: Terror threat: Four jailed in homemade bomb plot case
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