In US, search and rescue teams in Florida are due to swing into action as daylight reveals the extent of damage wreaked by Hurricane Irma. The huge storm weakened as it moved up the state's western coast overnight but Miami and other urban areas have been battered and inundated. <br/><br/>In the islands of the Florida Keys, the local emergency manager has warned of a looming humanitarian crisis. Media reports link at least four deaths to the storm. Irma is now a category one hurricane but still has maximum sustained winds of 120 kms per hour. <br/><br/>It cut a devastating track across 10 Caribbean countries and territories, killing at least 28 people there.<br/>More than 3.4 million homes in Florida are without power. Power lines came down in 80 per cent of Miami alone and large areas of the city were flooded, although the city appears to have escaped lightly compared to other parts.<br/>Drone footage from Naples, a town on the coast of the Gulf of Mexico about 200 kms to the north-west, shows rows of shattered suburban homes on streets under water.<br/><br/>US President Donald Trump has approved a major disaster declaration and emergency federal aid for Florida, describing the hurricane as a big monster.