The explosion had happened in the deep of night during a snowstorm.

He must have been the last one to run out of there before the second explosion happened.

A few minutes after the police left, the explosion happened!

There had been a dozen or so vehicles inside the wall when the explosion happened.

With that, he told them to get down, as a large explosion happened.

So the only surprise is that the explosion didn't happen before.

Several crew members said they had no idea how the explosion happened.

I had started to drive in the direction of the cabin, the place where the explosion happened.

The explosion happened at 1:23 pm on 10 September 2010.

They could be in the cave when the explosion happened.