What's the issue with metal detectors in Jerusalem?

By Miriam BergerJERUSALEM (Reuters) - For 10 days, Jerusalem has been in the grip of the worst bloodshed for years over Israel's decision to install metal detectors at the entrance to the Old City's holy compound.Some readers and observers have wondered how a simple matter of metal detectors - so common in so much of the world - could provoke such violence: a Palestinian man stabbed to death three members of an Israeli family in their home and three Palestinians have been shot dead by Israeli fo