The explosion occurred at the Chateau Beach Condo, in the Sunny Isles Beach neighborhood. A large hole can be seen in the building.
Multiple emergency units are on the scene, and it has been listed as a Level 3 Mass Casualty Incident, meaning at least 20 people are hurt, officials told WSVN.
"There was [an] explosion at the top of the building. We are on scene with Ocean Rescue, assisting them as they need us," said Sunny Isles Beach Sgt. Brian Schnell.
Pedestrians may have been struck by large pieces of concrete from a side wall. Glass and debris also rained down on beachgoers and hotel patrons next door to the condo.
Several people are being treated for severe burns and will be sent to area hospitals.
The building was under construction, officials told WTVJ.
An active gas leak was reported near the scene at the adjacent Travelodge Monaco, WFOR reported.
The 33-story building was under construction. Argentine developer Manuel Grosskopf and his father Sergio broke ground on the 84-residence project in January 2013. The completion date is listed only as 2015, according to real estate company Linda G Properties.
It is now a two-alarm fire, according to Alertpage Inc.
That's a pretty big hole. #Sunnyislesbeach #explosion pic.twitter.com/MkuJuHF64tโ Matthew (@TheKrinz) October 2, 2015
According to the American Meteor Society website, there were 12 reports of a fireball over Florida yesterday. Coincidence?
[Link]
There was also an Atlas rocket launch from Cape Canaveral yesterday - which was later attributed to this 'fireball' sighting posted on youtube. [Link]