Palestinian schoolgirls hold up flags during a protest to mark Prisoner's Day in the West Bank city of Nablus, Sunday, April 17, 2011. Some 5,500 Palestinians are held in Israeli prisons according to figures compiled in February 2011 by Israeli human rights group B'tselem. For more than 20 years, Palestinians have marked April 17 as Prisoner's Day. Photo by Wagdi Eshtayah (Newscom TagID: zumawirewestphotosfour946680) [Photo via Newscom]