President Donald J Trump International Airport in Florida suddenly slowed all flights as a precaution while an investigation into a 'suspicious phone call' is underway. 

The Palm Beach airport announced that law enforcement launched an investigation into a 'suspicious phone call' on Sunday afternoon at around 1.23pm. 

'Law enforcement is investigating a suspicious phone call. As a precaution, PBSO has slowed traffic entering the terminal,' officials wrote on X. 

The nature of the phone call remains unclear. 

'If you see something, say something. Report suspicious activity to law enforcement. Thanks for your patience & cooperation,' they continued. 

Officials noted that travelers may experience delays amid the investigation underway. 

In an update at around 2.30pm, officials announced that roadways to the terminal reopened and 'airport operations have returned to normal.'

'Thank you for your patience and understanding,' they wrote. 

The safety scare came just hours before the president was set to depart from the airport. 

Airport law enforcement told the Daily Mail they had no further details on the incident but said officials were investigating an incident around the airport.