At least one of the wounded was in critical condition at a hospital, police spokeswoman Kenia Alfonso said. Authorities didn't have anyone in custody and didn't know how many people were involved or what prompted the shooting outside a store in Liberty City.
"We have someone out there that is armed, it is a dangerous situation," Alfonso said.
When paramedics arrived, many of those who had been shot were lying in the street. Lt. Ignatius Carroll with Miami Fire Rescue said the scene was chaotic.
Six people were taken to trauma units and another person went to a hospital with less severe injuries, Carroll said.
"Anytime anybody goes to the trauma center, it's a serious injury," he said.
Dozens of police cruisers swarmed the area and blocked off streets after the shooting.
Authorities didn't immediately release the identities of any of the shooting victims, but did say none were children.
Liberty City's name comes from a housing project built in the 1930s for poor African-Americans and is known around Florida for its crime and grinding poverty. The median household income hovers around $18,000 a year, some $30,000 less than the U.S. average.
The city is also known for riots.
In 1979, a black insurance agent was beaten to death by white and Hispanic police officers. An all-white jury acquitted them and a three-day riot left 18 dead, countless injured and 850 arrested.
