Czech authorities on Monday dispatched a contingent of 40 police officers to help Macedonia patrol its border with Greece and keep migrants from making way further progress toward Western Europe.
The unit, the third sent to Macedonia since it and other countries sealed their borders to irregularly arriving migrants in February, will be armed for self-protection while on patrol with its Macedonian counterparts during a renewable six-month mission.
While border measures have stifled the massive flow of migrants, people are still making their way through the Balkans, often paying traffickers to provide transport along stretches of the journey.
In Belgrade on Monday, Serbian police said they had arrested one member of a trafficking group driving a van with 53 migrants crammed inside. International and local aid organizations estimate that 200-600 people filter through Serbia daily.