DFAT Have issued a travel advisory on Saudi Arabia:
This Advice was last issued on Friday, 17 October 2014. This advice contains new information under Safety and security (on 14 October 2014, one US national was killed and another injured during a shooting incident at a petrol station in Riyadh). We continue to advise Australians to reconsider their need to travel to Saudi Arabia.
Read the entire travel advice here: http://www.smartraveller.gov.au/zw-cgi/view/Advice/Saudi_Arabia