The wind of an F-15: Trump's tie blows in the wind as he exits Air Force One arriving in West Palm Beach on Friday. Two F-15s terrified residents as they rushed to intercept an unresponsive aircraft near Mar-a-Lago

A 'sonic boom' was heard in parts of South Florida on Friday as two F-15s raced to intercept an unresponsive aircraft near Donald Trump's Mar-a-Lago home in Palm Beach.

The two fighter jets were able to contact the general aviation aircraft, the North American Aerospace Defense Command said.

A statement reported by Fox News read: 'The intent of military intercepts is to have the identified aircraft re-establish communications with local FAA air traffic controllers and instruct the pilot to follow air traffic controllers' instructions to land safely for follow-in action.'

This follows another incident two weeks ago in which a private plane flew within two miles of Trump's aircraft on February 3.

And what is believed to be a rock was thrown at Trump's motorcade Friday afternoon, most likely as he was getting transported to Mar-a-Lago.

A law enforcement official told ABC: 'The presidential limo was not hit by the object, apparently a rock.'

The Secret Service is investigating the incident.

This follows another incident two weeks ago in which a private plane flew within two miles of Trump's aircraft on February 3. Pictured: Mar-a-Lago in Palm Beach, Florida, where Donald Trump has spent the past three weekends

What is believed to be a rock was thrown at Trump's motorcade Friday afternoon, most likely as he was getting transported to Mar-a-Lago. And a 'sonic boom' could be heard in parts of South Florida as the two fighter jets were able to contact the general aviation aircraft

A spokesperson said: 'The Secret Service can confirm that an object appears to have been thrown at the motorcade this afternoon.

'We are investigating at this time and don't have anything further,' The Hill reported.

Trump has spent the past three weekends at his Mar-a-Lago estate, which he referred to as the 'Southern White House' in a Saturday morning tweet.

He wrote: 'Will be having many meetings this weekend at The Southern White House.

'Big 5.00pm speech in Melbourne, Florida. A lot to talk about!'

It is thought that he may be meeting with candidates to select a new National Security Adviser to replace the disgraced Michael Flynn, who was fired on Monday.