Imran Khan has started his march from Islamabad to Southern Waziristan, a dangerous tribal area of Pakistan currently the target of CIA drone attacks.
The march has been denounced by various Pakistani Taliban factions, but Khan insisted it would go ahead:
This is a peace march, an effort for peace in Pakistan on our part ... We are not going to fight anyone.
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Police chief says the video can now be release without 'adversely impacting' the investigation.
The news was announced on Instagram by director Spike Lee who described him as a "dear friend" and "a great actor".
In a statement the pair said they remained "great friends" and "will continue to support each other".