Hungarian police say they will help patrol the Serbia-Macedonia border to try to stem the flow of migrants and refugees attempting to reach the European Union.

Hungarian police chief Karoly Papp said Monday that 20 officers and four mobile thermal cameras would be deployed from next week on Serbia's southern border with Macedonia, from where hundreds of migrants and refugees are crossing daily.

Traveling north across Serbia, refugees request asylum once they reach Hungary but most of them move further west to countries like Austria and Germany before their petitions are resolved. About 60,000 people have entered Hungary illegally this year, nearly all from Serbia.

Last week, Hungary said it planned to build a 4-meter (13-foot) high fence on its border with Serbia to stem the flow of migrants.