Video footage posted online showed a large portion of the building in the town of Surfside – just north of Miami Beach – reduced to rubble

It was unclear what caused the collapse and Surfside’s town manager said search operations could last a week

A 12-storey block of flats in Florida partially collapsed early on Thursday, killing at least one person and leaving 99 more unaccounted for as teams of rescuers combed the rubble for survivors.