1.   More often than not, when fog causes chain-reaction collisions, deaths follow.

2.   San Francisco International was a sea of confusion Sunday night, when fog caused delays of up to three hours.

3.   Valley fog will cause icy roads in parts of the Northwest.

4.   Cohen spent about five hours in Stuttgart after dense fog caused the cancellation of a planned helicopter trip and visit to a U.S. training area in northern Bavaria.

5.   Fog also caused problems in the Netherlands.

6.   Fog caused problem for pilots of rescue helicopters trying to ferry injured people from the scene.

7.   Heavy fog also caused dozens of car accidents across Poland in recent days.

8.   Heavy fog also caused dozens of car accidents across Poland.

9.   Heavy winter fog has caused transport disruptions this week, restricting movement of river ferries and buses and forcing many early morning flights to reschedule.

10.   The Coast Guard said heavy fog may have caused the collision, Anatolia reported.