According to the New York Times, a 27-year-old Briton accused of being apart of the bombing attack on July 21 was arrested in Rome Friday thanks to being tracked by his mobile phone.

The Italian police determined that Mr. Osman had bought a new prepaid cell phone calling card, which stores a name and number, on July 25. They arrested him on Friday.

Combined with security cameras, mobile phones were a major part of this investigation.