There have been a number of recent posts on jihadist websites encouraging attacks against western interests, including teachers and schools in the Middle East, and specifically Jeddah. In recent weeks 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.
There is considered to be a heightened threat of terrorist attack globally against western nationals from groups or individuals motivated by the conflict in Iraq and Syria.
There is a general threat from terrorism. Attacks could be indiscriminate, affecting western interests and places visited by foreigners. Opportunistic attacks on Saudi or western targets are also possible.
You should take great care in all areas close to the Saudi-Yemen border.