Miami police spokeswoman Frederica Burden said the shooting happened in the street and police were trying to determine how many were injured.
"It's very early in our investigation," she said. "I'm not sure how it occurred. We're investigating it now. I don't know if they were all outside standing, some in a car, some not in a car. I don't know that yet."
Some victims walked into the hospital on their own, Burden said. "We have some that were driven by friends and some that were actually transported by fire and rescue," she said.
A spokeswoman at Miami's Jackson Memorial Hospital said she could not release any information, including how many people were brought there Tuesday morning. She also said the patients had chosen not to release information about their medical conditions.
Miami Fire Rescue Lt. Ignatius Carroll told reporters a large crowd was at the scene when rescue units arrived. He described an "emotional scene outside with family members crowding around."
There was no word on a motive in the shooting, the conditions of the injured or possible arrests.
Copyright The Associated Press