These would-be attackers, most of whom were killed in the apartment, had been planning to pull off a second round of attacks this week in Paris's La Defense business district, according to authorities. Authorities tracked the phone’s movements prior to the attack, which led them to a safehouse in a Paris suburb where they engaged in an hours-long shootout with the other suspects early Wednesday. Reports in France say that investigators were able to locate some of the suspects' hideout this week using data from a cellphone apparently abandoned by one of the attackers in a trashcan outside the Bataclan concert hall where Friday's attack occurred, according to Le Monde.

But news reports of the Paris attacks have revealed that at least some of the time, the terrorists behind the attacks didn't bother to use encryption while communicating, allowing authorities to intercept and read their messages. In the wake of the Paris attacks, US government officials have been vocal in their condemnation of encryption, suggesting that US companies like Apple and Google have blood on their hands for refusing to give intelligence and law enforcement agencies backdoors to unlock customer phones and decrypt protected communications.

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