Nezar Hamze stood before those crowded into the mosque's prayer room, speaking through his headset mike. He explained their rights to self-defense and talked up the benefits of home security systems. And had all the women received their complimentary canisters of pepper spray? Nods spread across the room.

Good, said Hamze, nodding too. "I want to move on to extremism."

It had been 10 days since Omar Mateen, a self-declared adherent to the Islamic State, massacred 49 people at an Orlando nightclub. And Hamze, a police officer in the Broward County Sheriff's Office, wanted to prepare this mosque's congregants for what might come next.

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