Member states of the United Nations

Colombia and Venezuela recalled their ambassadors on Aug. 27 for consultations, amid mounting tensions that began nearly a week ago when Caracas closed off their shared border.

Serbian Orthodox Church (SPC) on Thursday said it sympathized with migrants from Syria, Iraq and other countries, transiting Serbia in large numbers.

Migrants and refugees from the Middle East are persistent in their attempt to cross from Serbia into Hungary, despite a fence Hungary is building on its border.

On the outskirts of Serbia's northern Horgos village, on the border with Hungary, B92's reporter on Wednesday saw several groups of refugees. They all gathered and continued toward the border, along a railroad.

Hungary has outlined plans to send the army, mounted police and dogs to its southern border to confront record numbers of migrants streaming into the European Union, many fleeing war in Syria. 

Unrest flared briefly at a crowded reception center in the border region of Roszke, with a police spokesman saying tear gas had been fired. 

Bulgarian soldiers and armored vehicles have been deployed on Wednesday morning on the country's border crossings with Macedonia and Greece.

Their task is "to prevent a possible spillover of the migrant crisis."

Serbian Prime Minister Aleksandar Vucic has told the Vienna daily Presse that "a single spark can ignite the whole region of the Western Balkans."

The EU will invest around EUR 222 million in 13 countries in the Danube region, including three non-members - Serbia, Bosnia-Herzegovina, and Montenegro.

This was announced on Tuesday by the EU Info Center in Belgrade.

A new wave of refugees is expected to reach the refugee reception centre in Presevo in southern Serbia, the Red Cross in Presevo said on Tuesday.

"At the moment, we have about 500 refugees but we have an information that during the day about 2,000 more will arrive," Ahmet Halimi, Secretary of the Red Cross in Presevo, said on Tuesday.

Bulgaria faces the bleakest demographic prospects on a global scale over the next 35 years, according to the 2015 World Population Prospects report of the United Nations Department of Economic and Social Affairs (DESA).

In the period 2015-2050, Bulgaria's population is expected to shrink by 27.9%.

More than 2,000 migrants on Monday crossed from Serbia to EU member Hungary, the Hungarian police said on Tuesday.

A total of 2,093 refugees entered Hungary, a record number to cross the said border in one day, a statement said.