Police say there is no threat to former President Donald Trump's rally site on Long Island following a false report of explosives found in a car.

Crowds were already gathering at Nassau Coliseum surrounded by swarms of Secret Service agents on Wednesday morning when the hoax emerged.

A spokesperson for the Nassau County Police Department confirmed to DailyMail.com that 'there was a suspicious occurrence' on Wednesday ahead of Trump's speech where thousands of MAGA fans are gathering.

But there is 'no validity' to a report that there was an 'explosive device found.' 

'Reports of explosives being found at the site are unfounded,' said Nassau County Commissioner of Police Patrick Ryder. 

He went on to blame a suspect with a 'self-trained bomb-detecting dog' for sounding the alarm about explosives near the rally site.