Twenty-three people were shot, including two fatally, early Sunday morning at the El Mula Banquet Hall in Hialeah, Florida, where a local rapper was celebrating his birthday.
The father of one victim interrupted Monday's news conference. Clayton Dillard could be heard shouting "killed my kid" and "killed my son!"
As the grieving father was escorted away, Miami-Dade Police Director Freddy Ramirez told reporters, "That's the pain that affects our community right there."
Police said they believe the shooting -- carried out by three gunmen -- was motivated by an "ongoing rivalry" between two groups.
The gunmen waited outside of the banquet hall for about 40 minutes and then opened fire on patrons as they left, Ramirez told ABC News on Sunday. Some patrons returned fire, Ramirez said, and over 100 shell casings were found at the scene.
At Monday's news conference, Miami-Dade County Commissioner Keon Hardemon called the shooting an act of domestic terrorism.
Police released surveillance video of the gunmen exiting a white Nissan Pathfinder at the scene. On Monday evening police said the car -- which was reported stolen on May 15 -- had been found, submerged in a canal.
Miami-Dade County Mayor Daniella Levine Cava vowed to "use every resource available to bring these people to justice."
Three survivors remain in critical condition, police said Monday.
The mayor also addressed gun violence more broadly, noting that over 30 people were shot this weekend.
"We must break the cycle of violence," she said. "Gun violence is an epidemic and the pandemic has intensified it.
The reward for information on the banquet hall shooting has climbed to $130,000, according to Miami-Dade Crime Stoppers.