Plumes of smoke over Tehran and growing casualties: it is now day four of a widening conflict after the U.S. and Israel launched strikes on Iran. Iran launched counter-attacks across the region as Israel and Hezbollah traded fire. U.S. President Donald Trump says the military campaign could last weeks and warns Iran of larger strikes. And China gears up for its two sessions, the country's biggest and most important political event, setting the agenda for economic and social priorities.