Allah's will... (no seriously, this is how they comfort themselves...its their gods will that they got killed)
It was great when they interviewed a guy on R4 who arranges trips to Mecca for pilgrims. He said that although the Saudis had said it was God's will, that was complete rubbish: Allah didn't have anything to do with it and it was just crass stupidity, completely human and poor organisation. Really refreshing to hear comments like that from someone who I assume is a Muslim.