In August 1990, an unrecognized mono-ethnic referendum was held in regions with a substantial Serb population which would later become known as the Republic of Serbian Krajina (RSK) (bordering western Bosnia and Herzegovina) on the question of Serb "sovereignty and autonomy" in Croatia. This was an attempt to counter changes made to the constitution. The Croatian government sent police forces to police stations in Serb-populated areas to seize their weapons. Among other incidents, local Serbs from the southern hinterlands of Croatia, mostly around the city of Knin, blocked roads to tourist destinations in Dalmatia. This incident is known as the "Log Revolution". Years later, during Martić's trial, Babić claimed he was tricked by Martić into agreeing to the Log Revolution, and that it and the entire war in Croatia was Martić's responsibility, and had been orchestrated by Belgrade. The statement was corroborated by Martić in an interview published in 1991. Babić confirmed that by July 1991 Milošević had taken over control of the Yugoslav People's Army (JNA). The Croatian government responded to the blockade of roads by sending special police teams in helicopters to the scene, but were intercepted by SFR Yugoslav Air Force fighter jets and forced to turn back to Zagreb. The Serbs felled pine trees or used bulldozers to block roads to seal off towns like Knin and Benkovac near the Adriatic coast. On 18 August 1990, the Serbian newspaper "Večernje novosti" claimed "almost two million Serbs were ready to go to Croatia to fight".