Police called on the aliens, aged from 4 to 35, to stop but they ran. Police fired into the air and eventually captured them, a statement said.
Illegal immigration is a daily problem in Romania.
The country needs to tighten border controls to qualify for membership of the European Union. Waves of immigrants from the former Soviet Union and Asia traverse Romania on their way to Western Europe. Romanians also illegally emigrate to the West. The Ukrainians and Russians were caught on the Ukrainian-Romanian border, while the three Syrians were apprehended at Bucharest's Otopeni airport. Romania is to host a one-day conference, organized by the International Organization for Migration on Monday, about ways to combat the rise in human trafficking in the region.