A Palestinian was killed on Sunday when a grenade he tried to throw at Israeli troops in the occupied West Bank exploded prematurely, Reuters quoted witnesses and the Israeli army as saying. They said the 18-year-old member of al-Aqsa Martyrs Brigades, attempted to attack soldiers scouring Balata refugee camp in Nablus for suspects spearheading a five-year-old uprising. Three suspects were arrested, the army said.