The northern eyewall of the storm reached the Florida Keys earlier this morning.
Authorities are urging people who chose to ride out Hurricane Irma to remain indoors until the storm passes.
In a Facebook post early Sunday, Key West police urged people who stayed for the hurricane to remain where they took shelter until the storm had passed completely. They also urged people not to go outside when the eye of the storm is over there area, a time period when conditions can seem deceptively calm.
The National Weather Service in Miami has issued tornado warnings for a wide swath of Monroe, Miami-Dade and Broward counties in South Florida.
City of Miami Beach says "rescue teams are no longer able to respond" due to extreme winds
One report says 600,000 people are without power.