How does the author use repetition in the novel, The Terrorist?

The narrative is filled with questions, suspicion, and fast paced sentences, as well as repetition. For example, "bombs" is mentioned four times in one page, while at the end of the book, the word "kill" fills Laura's brain, bringing the novel to its third and final climax where the true terrorist is "unveiled."

Example of Repetition:

"Nothing is more frightening than nothing.... But there was nothing. She imagined the truth as nothing. Billy as nothing. God as nothing. It was too terrible. There had to be something."