Daily Mail reporters in attendance reported hearing three to four shots and hearing Secret Service agents yelling to get down.

Some in the crowd reported hearing what they believed to be five to eight shots fired.

The banquet hall — where hundreds of prominent journalists, celebrities and national leaders were awaiting Trump’s speech — was immediately evacuated.

Members of the National Guard took up position inside the building as people were allowed to leave but not re-enter. Security outside was also extremely tight.

It was not immediately clear what happened. A law enforcement official confirmed there was a shooter but no further details were immediately available.