PRISTINA, Kosovo—A public building in Kosovo was set on fire and another was hit by grenades that did not explode in what government officials described Saturday as criminal acts related to ethnic Serbs protesting the decision to remove Serbian license plates from cars entering the country. Serbian media quoted the head of the Zubin Potok fire department, Sasa Bozovic, as saying a fire that broke out overnight at the town’s municipal building engulfed two offices. Bozovic did not identify the cause of the fire. The Kosovo Interior Ministry said the blaze burned down a vehicle registration office. Ethnic Serbs angry over the removal of Serbian license plates have blocked the Kosovo-Serbia border with trucks since Monday. “The Center of Vehicle Registration at the Zubin Potok commune has been burned by suspects in a criminal act with terrorist elements,” Interior Minister Xhelal Svecla wrote on Facebook. In Zvecan, a town about …