A Palestinian protester uses a sling to hurl a stone at Israeli troops during clashes following a rally to show solidarity with Palestinian prisoners held in Israeli jails, in the West Bank city of Hebron on May 16. Some 120 Palestinians jailed without trial in Israel have been on an open-ended hunger strike, eating only salt and drinking water, for the past 23 days to demand an end to so-called "administrative detention". Reuters/Mussa Qawasma