BELGRADE – The Hungarian authorities deployed on Wednesday 6,000 additional policemen on border with Serbia to stop undocumented migrants from entering, local media reported.

Budapest stepped up security of the border it shares with Serbia and Croatia on Tuesday, setting up an 8-kilometer (5-mile) security zone.

In addition to the police Hungary is also using helicopters, armored vehicles and dog handlers to locate migrants, the Radio Television of Serbia broadcaster said.

According to Hungary’s chief national security adviser Gyorgy Bakondi, the migrants are being returned to transit zones to file asylum applications.

The broadcaster said that Budapest accepted 264 applications out of 22,000 filed in 2016.