Authorities are downplaying this but it would appear that, like the way they downplayed the recent incident of an Egyptian who entered this country on a Sudanese passport test flying a pilotless drone aircraft capable of carrying several hundred pounds of explosives, there is probably more here than the police are willing to say:

More details emerging from Denver as we write this in the predawn hours on the now-suspected plot to assassinate Democratic presidential nominee Barack Obama with a high-powered rifle on national television during his outdoor acceptance speech at Invesco Field on Thursday night.

Authorities have reported a fourth arrest in the unfolding plot that The Ticket first wrote about here a few hours ago at the end of Monday night's Democratic National Convention events at the Pepsi Center.

We knew then that authorities in suburban Aurora had stopped a pickup truck for swerving between lanes early Sunday morning in what they thought was a routine drunk driving incident.

But in the rented vehicle of Tharin Gartrell, a 28-year-old convicted felon (see photo), they found two high-powered scoped rifles, ammunition, sighting scopes, radios, a cellphone, a bulletproof vest, wigs, drugs and fake IDs.

According to Brian Maass of Denver's KCNC Channel 4, under questioning Gartrell implicated two other men -- Nathan Johnson, who is 32, and Shawn Adolph, who is 33 -- and Johnson's girlfriend, Natasha Gromack. Johnson also reportedly confirmed the plot to FBI and Secret Service interrogators.