Palestinian authorities reported finding bodies in mass graves at a hospital in Khan Younis this week after it was abandoned by Israeli troops
The Gulf Arab state "commends directives and decisions of Saudi King Salman on the issue of Kashoggi," WAM said on Twitter.
Saudi Arabia has said that Khashoggi, a prominent journalist, died in a fight inside its Istanbul consulate - after two weeks of denials that it had anything to do with his disappearance - and dismissed five officials over the incident.