This report, MH17: Potential Suspects and Witnesses from the 53rd Anti-Aircraft Missile Brigade, presents information regarding the Russian brigade that we believe provided, and possibly operated, the Buk-M1 missile launcher that downed Malaysian Airlines Flight 17. In this post, we will summarize the role of the 53rd Anti-Aircraft Missile Brigade and “Buk 3×2” in the downing of MH17 before providing a summary of the report. At the bottom of this post, an index is provided of Bellingcat’s previously published major research projects on the MH17 disaster.