Normally they need reference letters and they sent special reference checks to the references you named! They contacted mine and asked them to fill out an attachment to their email and to return it! AFter my boss had done this they sent me the info that I have to undergo the security clearance and that the HR will call me!
If you are not sure give them a call! Sometimes it takes a long time but you always have to remember them as they are very very busy with recruiting!
Good luck + Cu in ABuDhabi!