The U.N. Security Council has condemned attacks on Serbian police in the border area near Kosovo. The council issued a joint statement on late Wednesday night, saying it demanded an ''immediate investigation so that the perpetrators could be punished.

Attacks by armed guerrillas of Albanian ethnicity have killed four policemen and wounded 13 others over the past four days, as informed by Yugoslavian authorities.

The government in Belgrade demanded immediate measures from the U.N. To stop what it called ''criminal acts'' and to make the ''Albanian terrorists'' take responsibility for them. If those measures weren't instituted, the government said that a new war could break out in the region. The Albanian terrorists are working to force the breaking away from Serbia of the border area, where the majority of the population is Albanian. Bureau Report