Israel has warned that Iran could try to attack the US if it acquired a nuclear weapon. Ehud Barak, the Israeli defence minister, appealed to world leaders to act now to prevent Iran from continuing its nuclear programme. "If it built even a primitive nuclear weapon like the type that destroyed Hiroshima, Iran would not hesitate to load it on a ship, arm it with a detonator operated by GPS and sail it into a vital port on the east coast of North America," Mr Barak told a conference of the Institute for National Security Studies at Tel Aviv University....