1.   The explosion occurred when gas fumes from an open valve ignited.

2.   Bronnoysund Sheriff Kurt Nilsen said investigators found a series of open valves in the hull when the boat was raised late Wednesday.

3.   Douglas said the open valve on the tank aroused suspicion that somebody had tried to steal the anhydrous ammonia, which can be used to make the drug methamphetamine.

4.   Troopers in hazardous-materials suits reached the tank early this morning and shut off an open valve to stop the leak.

5.   Troopers in hazardous-materials suits reached the tank early Sunday and shut off an open valve to stop the leak.