Recently there have been numerous assassination attempts on leading rebels in their eastern stronghold of Benghazi.
Libyans fighting to depose Muammar Gaddafi say he is using hitmen - an invisible force - to carry out targeted killings.
Some documents have been found, detailing those set to be killed. And many more so-called 'Gadaffi lists' are thought to exist.
Al Jazeera's Tony Birtley reports from Benghazi.
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