Those who were shot were transported to Ryder Trauma Center, the police chief said.
Another witness inside the gym when the shooting occurred said he knew the shooter and described him as "quiet", but "nice guy".
An eyewitness at the scene shot video of a rescue helicopter landing at the nearby Coral Gables Senior High School. "It was too loud for it to have been a weight dropping".
Miami-Dade County police confirmed the shooting involved a disgruntled former employee of the gym, and that one of the victims was in a managerial position there. "I heard from a trainer that it was a trainer that had been let go".
No one was being sought in connection with the shooting, Perez said.
Authorities secured the Shops at Merrick Park on Saturday after a lone gunman opened fire inside Equinox Fitness Club. Michelle said they hid in the back of a store.
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Tim Hartog, general manager of Yard House restaurant, said his business was on lockdown for a time. "The entire mall is locked down and the road in front is closed too".
Witnesses said the shooting appeared to be a workplace dispute rather than an attempt to kill or injure as many people as possible.
About 100 people were lunching on Yard House's outdoor patio when the shooting began. "It was just insane".
A representative of the Miami-Dade Police Department, which is now handling the case according to Denham, could not immediately be reached.
A call to Equinox was forwarded to the Brickell location of the fitness where a woman said: "I'm not sorry we're not taking any calls from the media".