"A teacher took a gun and then he went to the school room and he killed the assistant school principal and one of the employees," said the source who asked not to be identified because a formal statement would come later from Riyadh police.
Police are treating the case as a criminal matter and "not a terrorist incident," the source told AFP.
According to his latest information the suspect, of Iraqi origin, was still being sought.
The shooting occurred at Kingdom School, which is part of a group owned by Prince Alwaleed bin Talal, chairman of Kingdom Holding Co whose diversified investments include Citigroup and Time Warner.
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