Alva Review-Courier -

BRUNSWICK, Ga. (AP) — Months before Ahmaud Arbery was killed, shooter Travis McMichael wrote a simple, chilling response to a Facebook post about a suspected car burglary in his Georgia neighborhood: "Arm up."

The item he commented on was sandwiched between chats about lost dogs and water service interruption, like in many online communities in the U.S. based around physical neighborhoods.

But in the year before Arbery's death, the posts in the Facebook group for the subdivision where McMichael lived portray a neighborhood increasingly on edge over low-level incidents, with residents swapping...