The incident occurred at some point between midnight and 1 a.m.in Miami-Dade County in Florida when a white Nissan Pathfinder drove up to a location that was being rented for a scheduled concert, exited the vehicle and began unloading their firearms on the crowd, according to Miami-Dade police director Alfredo Ramirez who briefed the media early Sunday morning.
A white SUV pulled up to the location and three people got out with assault weapons and handguns and started firing into the crowd that was gathered for a concert at the venue, U.S. news channel CNN reported.
More than 20 victims with injuries were taken to hospitals, police said in a news release. "They say that some guys came out with hoodies and ski masks and just started spraying at the crowd", she said, adding that it was "very scary".
Mr Ramirez called the shooting "a despicable act of gun violence, a cowardly act".
Florida police continue to investigate the shooting. CBS4 Miami said at least one victim remained in critical condition, and that police had no one in custody as of midday Sunday.
Marcus Lemonis, star of the CNBC show "The Profit", tweeted that he was offering a $100,000 reward to help authorities find and convict the attackers - an offer that was welcomed by authorities and local officials.
Gun-related homicides have surged across the United States over the past year.
The coronavirus pandemic provided a pause in this deadly workplace violence, but the reopening of many companies has brought a return of shootings.
"This type of gun violence has to stop", Ramirez said.
The number of people who were killed with guns, including suicides, surpassed 43,000 in 2020, the research group said.
That followed recent mass shootings in Indiana, California, Colorado and Georgia.