Jacko Postpones Shows -- Blame Game Begins

You can't say you didn't see this coming -- Michael Jackson has already postponed his first four London concerts ... and the finger pointing has already begun.

Jacko's first show has been pushed back 5 days to July 13 and the other 3 were postponed until March of 2010. On the record, concert promoters are saying it's because they need more time to set up the complex stage -- but that's not what we heard.

Sources close to the situation tell us Jacko is pushing back the dates because he's physically unable to get through an entire show.