Investigators: Shooters Planned California Attack for a Year

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range – n. a place where people can practice shooting guns

radicalize – v. to cause (someone or something) to become more radical -- especially in politics

on the basis of – expression using as a reason for doing something

prohibit – v. to order (someone) not to use or do something

scourge – n. someone or something that causes a great amount of trouble or suffering

defer to – v. to agree to follow (someone else’s decision, a tradition, etc.)

focus – v. to cause (something, such as attention) to be directed at something specific (+ on)