Given a document, identify the topic.
The citizens of the town were scared when they heard a loud explosion.
The topic of the given document is an explosion in a town.
Complete the following task based on the instruction and optional input provided.### Instruction:
Given a document, identify the topic.

### Input:
The citizens of the town were scared when they heard a loud explosion.

### Output:
The topic of the given document is an explosion in a town.