Small groups of migrants are continuing to sneak into Hungary from Serbia, a day after the country sealed its border and began arresting asylum-seekers trying to breach the new razor-wire barrier.

Early Wednesday, police on horseback surrounded a group of 14 Afghans, including five young girls and an elderly woman, in a field close to the fence made up of three rolls of razor wire.

Small groups of young men also walked along roads leading away from the border. One asked a passing reporter: "Is this the way to Budapest?"

The evidence of crossings came a day after Hungarian police arrested at least 174 migrants for illegally breaching the border or damaging the fence.