"It's the most dangerous phenomena we've seen in the nonproliferation area for many years."

He called for "the most resolute measures to combat this socially dangerous phenomenon."

"It's a dangerous phenomenon, to use the Internet this way."

Nor was it in the vicinity of any dangerous phenomena.

Load shifting is a dangerous phenomenon in water, air and even ground transportation.

But fire is also one of the most dangerous phenomena in the world, and this fact wasn't lost on early humans.

The Arab basement, though, is a new and much more dangerous phenomenon.

"Psychologically, that's a dangerous phenomenon because it means we're not in control and our jobs are running us."

Poverty is a dangerous phenomenon, particularly among children, because, in many cases, it is hereditary.

The report called this "a new and very dangerous phenomenon" for the Sudan.