The first message decrypted was the 18 July report on the mass murders by the Police Regiment Centre of over 1,100 Jews at Slonim, in the Army Group Centre Rear Area. In late July and early August, similar reports were intercepted on a regular basis. The first messages mentioning the murders by the Police Regiment South were intercepted on August 23, with Police Battalion 314 reporting executions of 367 Jews south-east of Kiev.[12]