|I know some people in the kingdom, one of whom shares an office with someone who lived in the compounds, and was out for a run 15 mins before the attack (he has wounds from flying glass).
His statement is that they went round round the compound throwing grenades into peoples villa's and firing indiscriminately.
In terms of the attack, they are ssaying that a lead car burst through the gates, followed by the matyrdoom vehicles. Apparently one of which blew up early, going through the gates, and thus, setting the others off, and probably saving many lives. Most have the Saudi Guard for preventing the loss of more life.