Croatia became the latest country to try to stem the flow of refugees, by closing seven of its eight border crossings with Serbia “until further notice,”

The move was announced by the country's interior ministry after 11,000 migrants crossed the border within 48 hours.

The migrants, who Slovenia said did not have the correct papers, will be sent back to the Zagreb, the Croatian capital, a border police spokesman said.

Earlier in the day Hungary declared success for its controversial efforts to seal its borders to migrants , as thousands of new arrivals begin heading into neighbouring Croatia instead.

In a defence of its decision to fence off its frontier and repel migrants with tear gas and water cannon, the government said the fact that migrants were now seeking other routes into Europe vindicated its strategy.

Janos Lazar, the chief of staff to Viktor Orban, the country's Right-wing prime minister, said the "assertive, uncompromising defence of the border has visibly held back human trafficking and forces them to change direction. That was the aim of the entire action".

Croatia became the latest country try to stem the flow of refugees by closing seven of its eight border crossings with Serbia "until further notice".

The move was announced by the country's interior ministry after 11,000 migrants crossed the border within 48 hours.

Meanwhile Slovenian police stopped a train carrying 150 refugees at its border with Croatia.

The migrants, who Slovenia said did not have the correct papers, will be sent back to the Zagreb, the Croatian capital, a border police spokesman said.

Earlier in the day Hungary declared success for its controversial efforts to seal its borders to migrants, as thousands of new arrivals begin heading into neighbouring Croatia instead.

In a defence of its decision to fence off its frontier and repel migrants with tear gas and water cannon, the government said the fact that migrants were now seeking other routes into Europe vindicated its strategy.

Janos Lazar, the chief of staff to Viktor Orban, the country's Right-wing prime minister, said the "assertive, uncompromising defence of the border has visibly held back human trafficking and forces them to change direction. That was the aim of the entire action".

• Croatian border chaos – as it happened

The comments from Mr Orban's office on Wednesday will cause anger among other EU member states, which will hold a major meeting next week in yet another bid to hammer out a common approach to the crisis.

Budapest's uncompromising stance, which led to fierce clashes earlier this as Hungarian riot police began turning migrants away from the border, was also denounced by Ban Ki-moon, the United Nations secretary-general. The UN's top official said he was "shocked" by Hungary's actions, adding that people "fleeing war and persecution ... must be treated with human dignity."