Fifth column?

There's a bit of a kerfuff going on in my part of the world about something called the "Trojan Horse" business.  The suggestion is that Muslim "hardliners" are secretly infiltrating schools and putting pressure on teachers and governors to provide an education more in line with their thinking and beliefs. The evidence for this is for the most part anecdotal, and mainly second-hand anecdotal at that ("I know somebody who knows somebody who...).  Is there anything in it, and if there is, what if anything should we do about it? Whenever you get a clash of cultures, there is bound to be friction, and for either side to seek to impose their ideas on the other can only lead to trouble.  It's all a matter of balance and live-and-let-live, but that requires goodwill on both sides, and round here at least, I'm afraid that is in short supply.
As a post-script, the Education Secretary has appointed the former head of the Met's counter-terrorism force to head an inquiry into the matter.  Can't help but feel that this will do nothing to calm local feelings, by suggesting that what so far has been seen as an educational issue may in fact be a matter of potential terrorism..  Not a good move.