BRUSSELS (Reuters) - NATO confirmed on Monday that it had attacked an oil refinery near the Yugoslav capital Belgrade and targets at Novi Sad in overnight air raids. Serbian television showed fires raging at the refinery in Pancevo, on the east bank of the Danube across from Belgrade. It has been targeted several times since NATO began bombing Yugoslavia on March 24. Yugoslav media have reported that a missile hit a residential area in the northern city of Novi Sad on Sunday. The official said a surface-to-air (SAM) missile facility was operating in the region. "The bottom line is that there is a SAM production and storage site in that vicinity. That was attacked," he said. "We regret any harm to the civilian populace and we try very hard to try to minimise any collateral damage. Of course, to totally avoid that is relatively impossible." As NATO bombing neared its fourth week, the foreign ministers of the alliance‘s 19 countries met in Brussels to plot military, political and humanitarian strategy. Ministers lined up to stress that air strikes would continue until Yugoslav President Slobodan Milosevic stopped a crackdown on ethnic Albanians in the southern Serbian province of Kosovo. The official Yugoslav news agency Tanjug said there were two raids on military barracks in Pristina, the Kosovo capital, just after 0800 GMT on Monday and that NATO planes had been flying overhead all morning. It gave no details of casualties or damage. The NATO official said he had no details of Monday‘s raids. Tanjug said NATO missiles slammed into the Batajnica military airfield on the outskirts of Belgrade early on Monday. It said a car and arms factory in central Serbia, hit by NATO last week, had come under attack shortly after midnight. There were no immediate reports of casualties. NATO missiles also hit an industrial equipment factory at Krusevac in central Serbia. Bad weather, which has hampered NATO missions many times over the past 20 days, forced the cancellation of some overnight raids, the NATO official said. He said NATO was flying more relief supplies into Macedonia and Albania, which are bearing the brunt of an exodus of ethnic Albanian refugees from Kosovo.