Je suis Charlie. French for "I am Charlie," the phrase became a global expression of solidarity and resolve after Islamist gunmen murdered 12 people at the Paris offices of the satirical weekly Charlie Hebdo.

In a terrifying copycat attack Sunday in Garland, Texas, two men with assault rifles attempted to gun down people attending an event satirizing Muhammad with cartoons. A single police officer managed to shoot and kill both gunmen before they got inside the event. With some 200 people in the building, the potential for another politicized mass murder was great.

On Monday authorities said one of the gunman, Elton Simpson of Phoenix, had been under surveillance for years because of interest he'd shown in joining jihadist groups overseas. He was found guilty of making false statements to the FBI, but a federal judge ruled there wasn't enough evidence that Mr. Simpson's activities were "sufficiently 'related' to international terrorism."

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