Jillian York and Trevor Timm, writing for the EFF, explore the possibility that the Syrian government used satellite phone surveillance to pinpoint the locations of journalist Marie Colvin of the Sunday Times of London and French photographer Rémi Ochlik, who were murdered in Homs, Syria this week.

On Monday night, Colvin appeared on CNN, telling Anderson Cooper that "the Syrian army is shelling a city of cold, starving civilians." Responding to Syrian president Bashar Al Assad's statement that he was not targeting civilians in the barrage of rocketfire raining on Homs, Colvin accused the regime of "murder" and said: "There are no military targets here…It's a complete and utter lie that they are only going after terrorists." A few hours later, she was dead.

The Telegraph quoted Jean-Pierre Perrin, a journalist for the Paris-based Liberation newspaper who was with Colvin in Homs last week as saying: "The Syrian army issued orders to 'kill any journalist that set foot on Syrian soil'" and that the Syrian authorities were likely watching the CNN broadcast. The Telegraph then described how "[r]eporters working in Homs, which has been under siege since February 4, had become concerned in recent days that Syrian forces had 'locked on' to their satellite phone signals and attacked the buildings from which they were coming."

How could this happen?