of Operation Deny Flight fired on ARSK surface-to-air missile (SAM) sites at Udbina and Knin as SAM radars locked onto the jets. A few sources claim that they were deployed as a deterrent as the UN troops came under HV fire, and a subsequent UN Security Council report only notes that the deployment was a result of the deterioration of the military situation and resulting low security of the peacekeepers in the area. Also on 4 August, the RSK 105th Aviation Brigade based at Udbina, deployed helicopters against the Croatian special police on Velebit Mountain and against targets in the Gospić area virtually to no effect. On 5 August, the RSK air force began evacuating to Zalužani Airfield near Banja Luka, completing the move that day. At the same time the CAF deployed 11 MiG-21s to strike a communications facility and a storage site, as well as five other military positions throughout the RSK. That day, the CAF also deployed a Mi-24 to attack ARSK armour units near Sisak and five Mi-8s to transport casualties, and move troops and cargo. Five CAF MiG-21s sustained light damage in the process. The next day, jets struck an ARSK command post, a bridge and at least four other targets near Karlovac and Glina. A Mi-24 was deployed to the Slunj area to attack ARSK tanks, while three Mi-8s transported wounded personnel and supplies. An additional pair of MiG-21s was deployed to patrol the airspace over Ivanić Grad and intercept two Bosnian Serb fighter jets, but they failed to do so due to fog in the area and their low level of flight. The VRS aircraft subsequently managed to strike the Petrokemija chemical plant in Kutina. On 7 August, two VRS air force jets attacked a village in the Nova Gradiška area, just north of the Sava River—the international border in the area. The CAF bombed an ARSK command post, a storage facility and several tanks near Bosanski Petrovac. CAF jets also struck a column of Serb refugees near Bosanski Petrovac, killing nine people, including four children. Croatia has denied that it targeted civilians. On 8 August, the CAF performed its last combat sorties in the operation, striking tanks and armoured vehicles between Bosanski Novi and Prijedor, and two of its MiG-21s were damaged. The same day, UN military observers deployed at Croatian airfields claimed that the CAF attacked military targets and civilians in