What about some real action instead of the regular chit-chat about who *might* be behind a sniper that is yet to catch ?
Since most of the shooting occured in Borealis' main street, we should look for possible lign of sight. The most obvious spots are the two hills south of the city. With the adequate gun and scope, a sniper covers a wide angle, and can escape even before the body of its victim has fallen to the ground. To the North, East and West, LoS is blocked either by buildings or trees, it would take an inhuman shooter to perform a killing in these conditions. What about setting up patrols in this area and see if we get anything ? In Borealis, we can find good Agents willing to keep an eye on possible spots, can't we ?
This makes me wonder... We all assume here that the shooter is human, or human-like. What if...