EU foreign affairs head Federica Mogherini said the refugee influx, which has opened deep divisions in the bloc, is here to stay and member states must adjust to that new reality.

"It is here to stay; the sooner we accept it, the sooner we will be able to respond effectively (and) united as Europeans," Mogherini said after a two-day informal meeting of EU foreign ministers.

Hundreds of migrants stormed Budapest's main international station early Thursday after police re-opened it following a two-day standoff only to find that train services to western Europe had been suspended.

The main entrance was re-opened around 08:15 am (0615 GMT) and migrants burst in, rushing towards a train standing on one of the platforms, pushing, shoving and fighting with each other to get on board.

Harrowing pictures of a drowned Syrian boy washed up on a Turkish beach brought home the horror of the escalating refugee crisis Thursday as Europe was accused of letting the Mediterranean become a "cemetery" for migrants.

Turkey's President Recep Tayyip Erdogan bluntly blamed EU states for the death of every single migrant who lost their lives making the perilous journey to Europe.

Italy is ready to impose identification checks at Brennero on the border with Austria after receiving a request from Germany for help in easing the flow of migrants into Bavaria, the northern province of Bolzano said Wednesday.

Rome was ready to "reactivate" controls just as it did for the G7 in June, as "a temporary measure to allow Bavaria to reorganise and face the emergency", a statement from the province said.

Austrian authorities said Tuesday police have made two more arrests over the gruesome discovery last week of 71 dead migrants in an abandoned truck on an Austrian motorway.

One man was arrested in Bulgaria and a second in Hungary, said Verena Strnad, spokeswoman for prosecutors in the area where the truck was found last Thursday.

The French prime minister was set to meet EU officials in the refugee pinch point of Calais on Monday as increasingly urgent efforts to deal with migration into Europe exposed divisions across the continent.

France is expecting several million euros more in aid from Brussels, a government source said, to help deal with the thousands of migrants and refugees camped out in "The Jungle" around the northern port, hoping to reach Britain.

The hunt for people smugglers led to a security crackdown and massive tailbacks on Austria's border with Hungary on Monday, as Europe struggled to present a united front on the huge influx of migrants and refugees.

Austria's tightened security followed the discovery of 71 dead migrants, four of them children, in an abandoned lorry near the border with Hungary last week.

Hungarian police said Sunday that they have arrested a fifth man over the deaths of 71 migrants found in an abandoned truck in Austria last week.

Police are investigating a "Bulgarian national, a male, on suspicion of committing the crime of people smuggling," police said in a statement. The arrest was made late Saturday.

Four suspects in Austria's migrant truck tragedy were remanded in custody for another month in Hungary on Saturday, as a "horrified and heartbroken" U.N. chief called for concerted action to end Europe's refugee crisis.

Police believe the three Bulgarians and one Afghan held over the 71 deaths to be low-ranking members of one of the numerous human trafficking gangs that many of the tens of thousands of migrants coming to Europe pay for help.

Hungary said Friday it has arrested four people over the discovery of 71 decomposing bodies in an abandoned truck in Austria, another grim tragedy involving migrants desperately seeking refuge in Europe.

In the horrific incident -- a rare occurrence on land in a prosperous country when so many migrants have died at sea -- Austrian police said the dead were likely Syrians and included a toddler and three young boys.