Secret Service agents are in 'high intensity' mode today after a Polish tabloid published a series of photographs taken from a video of President Barack Obama working out in the gym at his exclusive Warsaw hotel. The problem is, no one knows who shot the video!

Obama, who is in Poland to rally Eastern European support against recent Russian aggression, was filmed exercising at the pricey Warsaw Marriott ... and somehow whoever took the video managed to do so without being cleared by Secret Service.

Agents are assuming the video was made by a hidden camera, planted some time prior to the President's arrival. However the camera did escape detection when the Chief Exec's security detail made their 'sweep' of the room. And THAT is causing great concern.