Spring breakers invading Miami Beach have become so uncontrollable that authorities imposed a curfew on Saturday and declared a state of emergency as SWAT teams were seen moving in to clear people out. A SWAT vehicle was filmed moving down Ocean Drive - a popular party street - and using an LRAD, also known as a sound cannon, to get people to disperse, video posted to Twitter shows. The move to control the crowds followed weeks of wild partying in Miami Beach, which is no stranger to uncontrollable spring break throngs of young people.