Macedonia closed its border to Afghan migrants early Sunday, Greek police said, slowing the admission of refugees to a trickle and leaving a growing bottleneck of people stuck at their shared border, according to AP. A Macedonian police spokeswoman denied there was any new prohibition regarding Afghans, blaming the problem on Serbia, the next nation along the Balkans migration route into Western Europe. By early afternoon, about 1,000 migrants were waiting at the Greek border camp in Idomeni, and at a gas station only 17 kilometers (11 miles) away, 80 buses with 4,000 more migrants were waiting to take them to the border. Greek police said Macedonia refused to let Afghans through because Serbia made the same decision and officials feared the migrants would get stuck in Macedonia.