Authenticity of Oksana Grigorieva pics in doubt

5:00 AM PDT 9/13/2010 by Allison Hope Weiner, AP

Mel Gibson's ex says photos show he assaulted her

Authorities investigating allegations of abuse by Mel Gibson and extortion by his ex-girlfriend Oksana Grigorieva are looking into the authenticity of several photographs depicting Grigorieva with facial injuries she claims were inflicted by Gibson, according to a source close to the investigation.