The US has demanded that Turkey close a stretch of its border with Syria being used as a crossing point by Islamic State terrorists.

Washington will no longer accept Ankara's claims that it cannot close the 60-mile section of the border used by ISIS fighters, following the atrocities in Paris that claimed the lives of 130 people.

The demand comes as EU leaders are set to hand Turkey £2.1billion in return for tightening its border security and clamping down on the flow of migrants into Europe.

Syria-Turkey border: The stretch between Jarabulus and Cobanbey - around 35 miles - is the main route used by ISIS militants. The 60-mile section between Jarabulus and Kilis remains open. Tal Abyad was closed by Turkey after the YPG took control of the area earlier this year

The border crossing at Tal Abyad was recaptured by the YPG and the Turkish side has since been closed

A senior official in President Barack Obama's administration told The Wall Street Journal: 'The game has changed. Enough is enough. The border needs to be sealed.

'This is an international threat, and it’s coming out of Syria and it’s coming through Turkish territory.'

The border between Jarabulus and Cobanbey - a stretch of about 35 miles - is the main route used by ISIS militants, according to US intelligence agencies.

This follows the recapturing of the border crossing at Tal Abyad by the Kurdish People's Protection Units, also known as the YPG, earlier this year, The Independent reports.

When ISIS controlled the Syrian side of the crossing, Turkey kept the border open, but then closed it when the area fell to Kurdish fighters.

The Independent reports that thousands of foreign fighters have crossed into Syria from Turkey to join ISIS, and crude oil from oilfields seized by the terror group have been transported into Turkey to be sold.

Vladimir Putin has openly accused Turkey of aiding ISIS following the downing of a Russian fighter jet.

A senior Turkish government official told The Wall Street Journal: 'Turkey is determined to clean Daesh (ISIS) from the 98 kilometers of border between Kilis and Jarabulus.

'There is no need to receive any kind of warning or advice from anyone, including our US partners.'

Heval Botan, a British YPG fighter based in Syria who has asked that only his nom de guerre be published, told MailOnline: '(President) Erdogan’s government keeps a solid straggle hold and embargo on areas that are under the control of the Kurdish YPG who are about the only effective force against these terrorist groups in Syria.

The border between Jarabulus and Cobanbey, a stretch of about 35 miles - is the main route used by ISIS militants. Pictured: Karkamis in Turkey across the border from Jarabulus

'Tal Abyad used to be the primary supply route between Raqqa and Turkey when Daesh controlled it and cross border traffic was huge,' one YPG fighter told MailOnline. Pictured: Sanliurfa in Turkey across the border from Tal Abyad

'Tal Abyad used to be the primary supply route between Raqqa and Turkey when Daesh controlled it and cross border traffic was huge.

'When the city fell to the YPG, Turkey closed the crossing and it has remained shut ever since.'

In addition to the £2.1billion being offered to Turkey by EU leaders at a summit in Brussels yesterday, Ankara is being offered an easing of visa restrictions as part of the deal which would see it taking back some migrants who don't qualify for asylum in Europe.

The country's Prime Minister Ahmet Davutoglu called the summit yesterday a 'new beginning' for relations with the EU.

Just hours after Turkey struck the deal with the EU, some 1,300 refugees were detained near the Turkish town of Ayvacik in Canakkale province, which is a main crossing point to the Greek island of Lesbos.

Turkish gendarmes apprehended hundreds of Syrians, Iraqis, Iranians and Afghans and, coastguard officials said.

They were planning to sail to Greece from hideouts near secluded Aegean beaches and forests, the authorities claim.

In the largest operation of its kind in recent months, the migrants were sent to a repatriation centre where some could face deportation.

According to the International Organisation for Migration, almost 900,000 people fleeing conflict and poverty in the Middle East, Africa and Asia have entered Europe this year.

More than 600,000 have entered through Greece, many after making the short sea crossing from Turkey.

A senior official in President Barack Obama's (left) administration said: 'The game has changed. Enough is enough. The border needs to be sealed.' Pictured right: Turkish Prime Minister Ahmet Davutoglu

David Cameron said yesterday that the summit mattered because the migrant crisis in Europe will not be solved without Ankara and that 'a comprehensive solution' is needed.

Turkey's Ahmet Davutoglu said he was 'thankful to all European leaders for this new beginning, which is not just a beginning of a meeting but the beginning of a new process, which is very important for the future of our common bond in Europe'.

Even if support for closer relations with Turkey has often been lukewarm at best in many of the EU member states, the refugee crisis has forced a drastic revision of relations with Ankara.

'Turkey is right to expect that the EU provides relief,' said German Chancellor Angela Merkel.

Others though pointed out that any aid had to be offset by Turkish commitments on reform and respect for human rights.

EU President Donald Tusk put it straight to Davutoglu during the opening session of the summit. In return for EU aid, he said: 'We expect to see an immediate and substantial reduction of irregular migrants arriving to Europe.'

He added, the EU nations want Turkey 'to realise the common objective of coming closer together through reforms, the upholding of the highest standards of human rights and media freedom and the implementation of agreed roadmaps and benchmarks' that are part of the EU membership talks.

Belgium's Prime Minister Charles Michel said Turkey could not be given a 'blank check' from the EU to help it handle the roughly two million Syrian refugees in the country and added his nation is not ready yet to free up money.