BELGRADE, Serbia (AP) — Serbian police say they have arrested a man after finding 34 migrants in his house in a Belgrade suburb.

Police said Thursday that the man is suspected of people smuggling for allegedly hiding the migrants in the house.

Serbia has stepped up efforts to curb the entry of migrants passing through in a bid to reach the European Union. Balkan nations closed their borders for migrants fleeing war and poverty in March, but the flow has continued through illegal routes used by people smugglers.

Hundreds of migrants have been camping along Serbia's border with EU-member Hungary, which allows about 30 people into the country per day.

More than 1 million migrants entered Europe in 2015.