Sri Lanka's Killing Fields trailer

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Time Out (4 *): "Tonight's gruelling film, anchored by Jon Snow, displays C4 journalism at its bold, devastating best, positing exceptionally convincing - and often necessary graphic - evidence of war crimes on both sides as the Sri Lankan govt crushed the remainder of the Tamil resistance."

Radio Times: "The reportage is forensic, but also about as horrific as TV can get. It's painful to watch but it raises serious questions about the Sri Lankan's government's version of events and about the consequences if the UN fails to pursue the evidence."

Follow events and reaction on Twitter, using the hashtag #killingfields.

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