Hundreds of migrants marching to Hungary border in protest

A Nigerian woman reacts onboard a boat of the Spanish NGO Proactiva Open Arms during a rescue operation on the Mediterranean sea, about 19 miles north of Az Zawiyah, Lybia, on Thursday, July 21, 2016. Over the past weeks, vessels from NGOs, several nations' military fleets and passing cargo ships have all rescued migrants from unseaworthy boats launched from Libya's shores. (AP Photo/Santi Palacios) (The Associated Press)

A Nigerian woman reacts onboard a boat of the Spanish NGO Proactiva Open Arms during a rescue operation on the Mediterranean sea, 19 miles north of Az Zawiyah, Lybia, on Thursday, July 21, 2016. Over the past weeks, vessels from NGOs, several nations' military fleets and passing cargo ships have all rescued migrants from unseaworthy boats launched from Libya's shores. (AP Photo/Santi Palacios) (The Associated Press)

Sub-saharan refugees and migrants, mostly from Nigeria, sail aboard a partially punctured rubber boat during a rescue operation on the Mediterranean sea, about 19 miles north of Az Zawiyah, Libya, on Thursday, July 21, 2016. Over the past weeks, vessels from NGOs, several nations' military fleets and passing cargo ships have all rescued migrants from unseaworthy boats launched from Libya's shores. (AP Photo/Santi Palacios) (The Associated Press)

Hundreds of migrants have set off on foot toward Serbia's border with Hungary to protest Hungary's decision to keep its border closed for most people trying to reach the European Union after fleeing war and poverty.

Migrants held makeshift banners reading "Hungary Open Borders" or "No Borders, No Fence" as they marched Friday in a long column along a road leading north from Belgrade. Several police cars drove slowly by the marchers. Most migrants appeared to be young men who stand little chance of entering Hungary or other EU nations.

Hungary has recently strengthened anti-migrant controls on its southern border with Serbia, letting in only about 30 people a day, mostly families with small children.

Many migrants have turned to human smugglers to help them cross the border.