There are probably better ways, but one is this:
Group the 6 images.
Drag them off the left edge of the slide.
Right-click, choose Custom Animation
Add Effect
Crawl In, hit OK
Double-click the animation in the task pane, choose Timing tab.
Choose "repeat until end of slide."

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>I have six images and I want to move them at the slide bottom contineously
> without any break. Example. as it happens on CNN or BBC that text bar
> moves
> continueously without stopping or breaking...