Wikileaks reveals video showing US air crew shooting down Iraqi civilians
Footage of July 2007 attack made public as Pentagon identifies website as threat to national security
* Chris McGreal in Washington
* guardian.co.uk, Monday 5 April 2010 20.52 BST
A secret video showing US air crew falsely claiming to have encountered a firefight in Baghdad and then laughing at the dead after launching an air strike that killed a dozen people, including two Iraqis working for Reuters news agency, was revealed by Wikileaks today.