Mancini Emerging As Favourite

The odds for Roberto Mancini becoming the next West Ham manager have been slashed by all the bookies with at least one now refusing to take bets.

Is this because the bookies are in the know or because Mancini has emerged as the fans' favourite (based on a few polls I've seen on West Ham boards) and they have all been slapping their money on Mancini?

Update:

Since lunchtime the money seems to have been piling on Donadoni. Bet 365 have slashed his odds from 20/1 to odds on.