Which helicopters were used in the Bin Laden raid?

Can anyone identify the crashed helicopter from the footage of the compound where Bin Laden was captured? Pakistani forces were quick to cover the wreckage, and are taking it away.

A day ago I heard on Pakistani news that a Pakistan Army helicopter has crashed in Abbottabad and all roads have been closed by the security forces. I tried to find the make of the helicopter, without any luck. Had no idea what was going on behind the scenes.

My personal thinking is that US would have tipped off the Pakistanis at some stage to avoid the security forces at Pakistan Military Academy, which is only few hundred meters away taking shots at the helicopters with Shoulder launched SAMs.

Also just heard on the BBC from an Ex Pakistan Army helicopter pilot who graduated from the same military academy, that due to the local geography (being a valley) there is no way the US forces could have come in without coming in Pakistani radars.