Replies: When a nuclear blast occurs, a number of things happen at once.

How do scientists determine if a nuclear blast has occurred?

He observed that the blast had occurred in the center of the bridge.

The blast occurred while the men were 1,900 feet underground.

The blast occurred just as the doors opened onto the platform.

The statement gave no other details about how the blast occurred or the intended target.

Later on however several other smaller blasts occurred across the city.

The following day, another blast occurred, this time at No. 4.

The blast occurred near a building where the governor was meeting with local officials.

He was working the night shift at the factory when the second blast occurred.