Masked Palestinian gunmen killed two Palestinian men suspected of collaborating with Israel on Thursday before displaying their bodies in the central square of the Tulkarem refugee camp, witnesses and Palestinian security officials said. The two men were abducted two weeks ago with six other men in a kidnapping planned by two militant groups, the Al Aqsa Martyr's Brigade and Islamic Jihad. The men were suspected of giving away the hideout of a wanted Al Aqsa militant, Palestinian security sources said. Al Aqsa is loosely affiliated with Palestinian leader Yasser Arafat's Fatah faction. Islamic Jihad, which receives funding from Iran, often...