At the same time, the Krajina army continued the Siege of Bihać, together with the Army of Republika Srpska from Bosnia. Michael Williams, an official of the UN peacekeeping force, said that when the village of Vedro Polje west of Bihać had fallen to a RSK unit in late November 1994, the siege entered the final stage. He added that heavy tank and artillery fire against the town of Velika Kladuša in the north of the Bihać enclave was coming from the RSK. Western military analysts said that among the array of Serbian surface-to-air missile systems that surround the Bihać pocket on Croatian territory, there was a modern SAM-2 system probably brought there from Belgrade. In response to the situation, the Security Council passed Resolution 958, which allowed NATO aircraft deployed as a part of the Operation Deny Flight to operate in Croatia. On November 21, NATO attacked the Udbina airfield controlled by the RSK, temporarily disabling runways. Following the Udbina strike, NATO continued to launch strikes in the area, and on November 23, after a NATO reconnaissance plane was illuminated by the radar of a surface-to-air missile (SAM) system, NATO planes attacked a SAM site near Dvor with AGM-88 HARM anti-radiation missiles.