In the immediate aftermath of the split, there was at least one failed attempt at a military coup d'état supported by the Soviets. It was headed by Yugoslav army officials: the chief of the General Staff Colonel General Arso Jovanović, Major General Branko Petričević Kadja, and Colonel Vladimir Dapčević. The plot was foiled and border guards killed Jovanović near Vršac while he was attempting to flee to Romania. Petričević was arrested in Belgrade, and Dapčević was arrested just as he was about to cross the Hungarian border. There was also a separate plan to assassinate Tito, which involved options for use of a biological agent and a poison codenamed Scavenger. The Soviet Ministry of State Security prepared the plan in 1952, but Stalin died before it could be executed.