On 21 April, the Saudi Ministry of Interior advised on its website that security forces had been placed on alert following reports of a threat to Aramco oil installations and shopping malls throughout the Kingdom.
There are regular posts on jihadist websites encouraging attacks against western interests, including teachers, schools and oil workers; other groups could be targeted.
In recent months there have been attacks on US, Danish and Canadian citizens in Saudi Arabia, in one case with fatal consequences. You should remain vigilant and alert to local security developments, and take suitable security precautions to enhance your safety.