Travelers flying out of Miami International Airport were thrown into chaos early on Memorial Day after sections of two terminals were evacuated.

Airport police noted a potential security threat just before 8am, leading to the partial evacuation of two terminals. 

Miami-Dade Sheriff's Office said they were responding to an unattended bag.

The panic inside the North and Central Terminals have also caused a backlog of vehicle traffic and delays as people try and approach the airport. 

Because of the suspicious item, TSA checkpoints 5, 6 and 7 and the pre-security area between doors 9 and 18 are closed, officers said. 

Police have now given the airport the all clear. 

Miami Airport said in a statement: 'We are working with our partners at the Miami-Dade Sheriff's Office regarding a potential security threat at MIA. 

'Out of an abundance of caution, portions of the North and Central Terminals prior to the security checkpoints have been temporarily evacuated. 

'This situation is also impacting vehicle traffic entering the airport and causing delays on both the arrivals and departures levels. 

'The safety of our employees and passengers remains our top priority. We appreciate your patience and understanding.'