A Palestinian protester uses a slingshot to throw back a tear gas canister fired by Israeli troops on the Gaza-Israel border, east of al-Bureij refugee camp in central Gaza Strip, on May 3, 2019. At least 50 Palestinians injured in clashes on Friday between demonstrators who joined the weekly anti-Israel protests and Israeli soldiers stationed on the border between eastern Gaza Strip and Israel, medics said. (Xinhua/Yasser Qudih)