World leaders were unanimous Wednesday in condemning the killing of Mohammad Abu Khdeir, a 16-year-old Palestinian who was most likely kidnapped and murdered in revenge for the death of three Israeli teens that were abducted and recently found dead in the West Bank. In a series of posts on Twitter, National Security Adviser Susan Rice said the US is paying close attention to the investigation into the death of 17-year-old Mohammed Abu Khdeir. She also offered condolences to his family and the Palestinian people. US Secretary of State John Kerry also condemned the murder, calling the act "sickening" and saying,...