Palestinian President Yasser Arafat gestures during a rally in the West Bank City of Ramallah, December 31, 2001. Thousands of Palestinians expressed solidarity with their leader on the 37th anniversary of his Fatah movement's foundation. REUTERS/Osama Silwadi
Source:
http://search.news.yahoo.com/search/...arafat%22&b=11
Another Reuters photographer also took a picture from a different angle. One or the other of these photos may have been flipped as the gesture appears to be done by both left and right arms. In fact it may have been one occurance. Looking closely at the facial features, which appear correct in each, I would guess that these are two different shots.
BTW, Osama may be using an assumed last name for security reasons.