The Palestinians accused Israeli extremists of abducting and killing an Arab teenager and burning his body Wednesday, sparking hours of clashes in east Jerusalem and drawing charges that the youth was murdered to avenge the killings of three kidnapped Israeli teens. Seeking to calm the explosive situation, Israeli Prime Minister Benjamin Netanyahu urged a swift inquiry into the “reprehensible murder” and called on people to respect the rule of law. Palestinian President Mahmoud Abbas said it was clear extremist Jewish settlers were responsible and called on Israel to bring the killers to justice. “The settlers have killed and burned a...