Americans tested G8 security by "smuggling explosives".
According to information provided to dpa [Deutsche Presse-Agentur], US security forces tested security at the G8 Summit in Heiligendamm by transporting a small amount of explosive material.
Dpa reports that the plastic explosives were hidden in a suitcase, and were discovered by German officers when they stopped a car at a checkpoint. Although only a "very small amount" of material was involved, the alarm was raised following an X-ray [examination of the suitcase]. The persons in the car, who were dressed in civilian clothing, then disclosed their identity as US security agents.
-- A slightly less trusting sub-editor might have placed the inverted commas elsewhere in that headline.