These murders are among those that Pres. Bush can roundly condemn. If the Yemenis are speaking as above, then this is an opportunity to speak and have people hear that something is sick in islam, AND that killing those of other religions is WRONG whether MOHAMMED says so or not.
I would have him say something like this: "IF Mohammed said that these murders of doctors saving lives is OK, then Mohammed is WRONG. If radical islamics are lying about what Mohammed has said, then those people are deceivers and should be brought to justice."